National Academies Press: OpenBook

Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth (2019)

Chapter: 3 The Effects of Summertime Experience on Children's Development

« Previous: 2 Summertime Experiences
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 55
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 56
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 57
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 58
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 59
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 60
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 61
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 62
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 63
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 64
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 65
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 66
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 67
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 68
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 69
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 70
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 71
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 72
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 73
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 74
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 75
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 76
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 77
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 78
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 79
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 80
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 81
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 82
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 83
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 84
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 85
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 86
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 87
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 88
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 89
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 90
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 91
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 92
Suggested Citation:"3 The Effects of Summertime Experience on Children's Development." National Academies of Sciences, Engineering, and Medicine. 2019. Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth. Washington, DC: The National Academies Press. doi: 10.17226/25546.
×
Page 93

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

3 The Effects of Summertime Experience on Children’s Development While children and youth have a variety of experiences during the summertime, there is evidence that access to high-quality experiences may not be equitable across different groups of children and youth, and this may have disparate effects on their development. In this chapter, we review what is known about how summer affects the development of children and youth across the four domains in the committee’s charge: (i) safety, risk-taking, and anti- and pro-social behavior, (ii) physical and mental health and health-promoting behaviors, (iii) social and emotional development, and (iv) academic learning and opportunities for enrichment. We address them in this order to reflect the fundamental need for safety and health as a precursor for social and emotional development and academic learning. The chapter begins with a brief description of the developmental needs and stages of children and youth. Next, it examines what is known about how summer influences this development and the seasonal patterns observed within each domain. The extent to which summer programs and camps have been found to influence outcomes in each of the four domains, as well as the programmatic factors that enhance program effectiveness, is discussed in Chapter 4. BOX 3-1 Key Findings Safety and Antisocial Behaviors  Crime rates and risk of crime victimization generally increase during the summer. Children and youth from low-income families and neighborhoods are at greatest risk.  Incidence of some antisocial behaviors falls among adolescents during the summer. Simple assault rates among adolescent youth are lowest during the summer and highest in the fall when the school year begins. Risk-taking Behaviors  Summer sees increases in the rates of first-time substance use; however, overall rates of drug use drop during the summer. Physical and Mental Health  Access to school-based food and nutrition programs is curtailed during the summer, resulting in increased risk of food insecurity among children and youth.  Weight gain accelerates in the summer, especially for children who are already overweight or have obesity. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-1

 The evidence is mixed on whether the rates of physical activity increase in the summer, but the majority of youth still do not meet recommended guidelines for moderate and vigorous physical activity during these months. There are also increases in sedentary behavior that may be more acute among children and youth from low-income families and neighborhoods.  Rates of mental health emergencies decrease during the summer. Social and Emotional Development  Widely documented gaps exist in social and emotional skill levels at kindergarten entry, with children from higher income backgrounds, girls, and white youth being rated by their teachers as has having more of these skills at the start of their schooling.  It remains unknown whether there are seasonal trajectories of social and emotional skill development in children and youth. Academic Learning and Enrichment  Summertime learning and enrichment draw on the resources available through children’s parents and in their local communities. Children from more economically advantaged families and neighborhoods have greater access to resources from their families and communities. DEVELOPMENTAL NEEDS OF CHILDREN AND YOUTH Before examining how summer affects their development, it is worth considering children’s and youth’s basic developmental needs, those that must be met in order for them to thrive. Maslow (1943) identified a basic set of needs: physiological (e.g., to satisfy hunger), followed by safety, and then by love/belonging (Maslow, 1943; see Figure 3-1). Each set of needs is conditioned upon meeting the ones before it, and motivation to meet these needs helps shape human behavior. If the more basic needs such as physiological ones are not met, a person cannot focus on higher-level needs, such as self-actualization. Once each set of needs is met, “other (and higher) needs emerge (p. 375).” Self‐ Actualization Esteem Love/Belonging Safety Physiological PREPUBLICATION COPY, UNCORRECTED PROOFS 3-2

FIGURE 3-1 Maslow’s (1943) hierarchy of needs. SOURCE: Maslow, 1943. We know that children need adequate nutrition and safety for health and social/emotional stimulation to support psychological and cognitive development (Hoynes et al., 2016; Malin et al., 2018). Basic needs for food and safety are year-round needs and, of course, do not pause during the summer. Research also shows that settings are critical to the development of physical, intellectual, psychological, social, and emotional skills and competencies (i.e., internal assets). In 2002, a National Research Council committee identified eight features of settings that support positive youth development (see Box 3-2). That committee highlighted that “exposure to positive experiences, settings, and people, as well as opportunities to gain and refine life skills, supports young people in the acquisition and growth of [their] assets” (National Research Council and Institute of Medicine, 2002, p. 7). BOX 3-2 Features of Positive Developmental Settings • Physical and psychological safety • Appropriate structure • Supportive relationships • Opportunities to belong • Positive social norms • Support for efficacy and mattering • Opportunities for skill building • Integration of family, school, and community efforts SOURCE: National Research Council, 2002. Optimal implementation of the features of settings that promote positive development will vary across different types of settings (e.g., home vs. summer camps) and for youth of different ages (e.g., elementary vs. high school aged students) and backgrounds. For example, appropriate structure for elementary school students will include greater adult oversight and supervision than for high school age youth. With this in mind, we provide a brief overview of the major developmental needs of youth across different age ranges. Because the committee’s statement of task focused on children and youth from the summer prior to kindergarten through grade 12, we focus our overview on these age groups. DEVELOPMENTAL STAGES OF SCHOOL-AGE CHILDREN AND YOUTH Physical, neurological, cognitive, and social and emotional changes occur within each child across time. Thus, what is both engaging and developmentally matched to the needs of a child at early elementary school age will differ from what engages and is developmentally appropriate for a child in later childhood and in different phases of adolescence. This is PREPUBLICATION COPY, UNCORRECTED PROOFS 3-3

important, because when a youth’s environment is mismatched with his or her developmental needs it will not be able to optimally support youth outcomes (Eccles et al., 1993).1 To promote thriving, developmental assets should be aligned with youth’s specific needs in each stage of their development. Importantly, skill development is not linear. Rather, it is extremely malleable and dependent on context, and it demonstrates both within- and between-youth variability (Cantor et al., 2018). How skills develop within particular contexts will depend on both individual susceptibility to environmental influences and the timing of different periods of brain development. Further, children come into settings with existing skills, competencies, and experiences that they can draw on to promote further development (Ambrose and Lovett, 2014; Deans for Impact, 2015). Early, Middle, and Late Childhood Child development during the preschool years is foundational in shaping the assets children will bring with them at the launch of their formal schooling. Understanding early childhood development is therefore essential to interpretating the trajectory of child development in the school years and beyond. The brain is continually changing as children experience new settings and interactions within settings (Baltes et al., 2006). The age of 0–3 are a sensitive period of rapid brain growth and development of emotions, language, cognition, and motor control. (Center on the Developing Child, 2016; Johnson et al., 2016; Tarullo et al., 2009). Experiences during this time set the stage for later development. In particular, increasing evidence has cited the importance of high-quality childcare and early education for fostering healthy development in early childhood and mitigating disparities in a range of outcomes that are present at school entry (Institute of Medicine, 2000; National Academies of Sciences, Engineering, and Medicine, 2019a). This evidence suggests there is also more to be learned about the importance of supportive settings for developmental outcomes in later childhood and adolescence, as well.2 In early childhood, children are learning to regulate their emotions and social relationships and to integrate their emotions, cognition, and behaviors (Espinet et al., 2012). Learning to identify and regulate emotions as well as direct attention are important tasks during this period (National Commission on Social, Emotional, and Academic Development, 2019) and children are still developing these skills when they enter school. Both executive function and theory of mind (defined below) develop during early childhood through a combination of cognitive, neural, and social developmental processes. Executive function comprises a variety of important and complex skills that include the ability to regulate attention and cognition and to plan, sequence, adjust, and organize behavior (Institute of Medicine, 2000). Theory of mind is the child’s understanding of themselves and others as having their own beliefs, motivations, and feelings (Astington and Edward, 2010; Wellman, 2014). The development of these regulatory 1 A comprehensive view of the specific developmental needs of children and youth in different domains across time is beyond the scope of this report but has been addressed by previous National Academies reports (e.g., Institute of Medicine, 2000; National Academies of Sciences, Engineering, and Medicine, 2019a). 2 For information on early childhood development (from birth to pre-K), the committee refers readers to prior National Academies reports, including From Neurons to Neighborhoods: The Science of Early Childhood Development (2000), Transforming the Workforce for Children Birth through Age 8: A Unifying Foundation (2015); A Roadmap to Reducing Childhood Poverty (2019); and Vibrant and Healthy Kids: Aligning Science, Practice, and Policy to Advance Health Equity (2019).  PREPUBLICATION COPY, UNCORRECTED PROOFS 3-4

processes in early childhood is “deeply embedded in the child’s relations with others” (Institute of Medicine, 2000, p. 122). The processes of self-regulation and executive function processes continue to undergo rapid development during middle childhood (Johnson et al., 2016). Children at all ages learn by exploring the world, and in a culturally situated manner they learn through scaffolding from adults and older peers (Rogoff 2003; Vygotsky, 1978). Indeed, nurturing relationships are critical to healthy child development (Britto et al., 2017). During early childhood, children are extremely sensitive to environmental influences. Thus, how they experience the school transition may influence their adjustment in ways that have long-term impacts on their developmental trajectories, and the transition can be made more difficult by social structural factors such as poverty, weak family structure, and a lack of available preschool (Entwisle and Alexander, 1998). Chronic stress has significant, negative consequences for brain development (Center on the Developing Child, 2016; Essex et al., 2011; Teicher et al., 2016). These effects can be compounded by environments that are not developmentally supportive (Osher et al., 2018). Cumulative effects of chronic stress can also impact later development (Blair and Diamond, 2008; Portilla et al., 2014). Indeed, adverse childhood experiences (ACES) have been linked to negative childhood educational outcomes (e.g., Blodgett and Lanigan, 2018) as well as later health and well-being outcomes, including mortality (e.g., Felitti et al., 2019). Yet these cumulative effects can also be mitigated when buffered by supportive environments (Fischer and Bidell, 2006), making it all the more critical to consider ways that summertime presents unique opportunities for providing developmentally promotive relationships and contexts for all children and youth. Participation in structured activities is important; a child’s participation in structured activities has been linked to cognitive and emotional development (Hofferth and Sandberg, 2001) as well as positive functioning in the areas of academic performance, psychological health, and behavior (Bartko & Eccles, 2003). While participation in structured activities is important for youth outcomes, research also suggests that, in fact, youth need a balance of structured and unstructured activities for optimal development. For instance, Mahoney and Stattin (2000) found that a lack of participation in unstructured activities was associated with antisocial behavior and that participation in structured activities was associated with prosocial behavior. Play, which is often unstructured, is critical to children’s development and can promote decision making, social skills, and creativity (Ginsburg, 2007). Play is an important tool for elementary-age children, both to engage them in academic learning and to foster growth and a sense of competency in a variety of developmental domains (Ginsburg, 2007; Milteer et al., 2012). Play promotes development in a number of areas, including cognitive, social emotional, and physical, and when engaged in with parents or other adults, play also promotes the development of supportive relationships (Yogman et al., 2018). Out-of-school and summer programs can play a variety of important roles in supporting healthy development during childhood. First, out-of-school and summer programs provide a setting for children to experience supportive social relationships with both adults and peers, relationships that foster emotional, behavioral, and cognitive development. Second, such programs offer an opportunity for both structured and unstructured play, as well as a child’s choice in activities. This may be particularly important as schools increasingly focus on structured academic learning, even in the early grades (Bassok et al., 2016), and as other societal changes, such as increased parental employment and greater digital engagement decrease PREPUBLICATION COPY, UNCORRECTED PROOFS 3-5

opportunities for unstructured play (Yogman et al., 2018). Third, some programs offer specific support for children with a history of adverse childhood experiences and trauma. Early Adolescence Overall, the brain demonstrates great plasticity during adolescence, a time when “learning and development are inextricably intertwined” (Harper et al., 2018, p. 6) and when the settings with which youth engage can provide developmentally supportive opportunities. Whereas we often frame the adolescent brain as “in development” or as a less mature version of the adult brain, it is important to realize that the adolescent brain is particularly well suited for achieving the developmental tasks associated with this period of development, when young people are transitioning from childhood to adulthood, gaining autonomy, and figuring out who they will be in the adult world (National Academies of Sciences, Engineering, and Medicine, 2019a). At the same time, early adolescents are susceptible to a number of mental and physical health risks (Harper et al., 2018a), which can affect their learning and development if they are not provided with appropriate supports, such as those from adults and developmentally aligned settings. The effects of stress, for example, are particularly pronounced during adolescence, and inequities associated with economic disadvantage, racism, and other types of structural discrimination all can harm the development of adolescents (Harper et al., 2018c). Whereas we think of adolescence as a time when youth begin to gravitate away from adults and towards peers, and peers do indeed take on increasing importance during adolescence, adult support is still critical for young people during this period. Adolescents are “especially sensitive to the attitudes and behaviors of adult members of the community” (National Academies of Sciences, Engineering, and Medicine, 2019a, p. 5). Further, while adolescents experience increasing independence and desire more autonomy than children, they also report that the demands of this independence can be stressful, particularly when they don’t feel they have needed supports (National Academies of Sciences, Engineering, and Medicine, 2019). Thus, both parents and other caring adults, such as natural mentors (supportive adults who occur naturally in a youth’s social network) are important sources of support that promote positive development and resiliency for adolescents (National Academies of Sciences, Engineering, and Medicine, 2019a). During early adolescence, physiological, neurological, and contextual changes occur simultaneously (Nelson et al., 2005; Sisk and Zehr, 2005), leading to a period of great opportunity for brain malleability. This period results in greater capacities for conceptual thinking, regulation, and judgment (Siegel, 2013). It also includes greater tendencies toward risk- taking, both positive and negative, and greater impulsivity through shifts in the brain’s dopamine-linked reward system (Siegel, 2013; Osher et al., 2018). When children enter adolescence, they become increasingly sensitive to social cues and to social recognition and rewards (Harper et al., 2018b). This can lead to impulsive decision making in certain situations, particularly in the presence of peers, to whose influence adolescents can be susceptible (National Academies of Sciences, Engineering, and Medicine, 2019a). The increased sensitivity to peer influence and social belonging during this period means that adolescents are open to both positive and negative peer pressure, making opportunities to engage in positive activities with prosocial peers all the more important. At the same time, programs that engage youth who are at risk for or already engaging in risky or anti-social behaviors are vulnerable to contagion effects PREPUBLICATION COPY, UNCORRECTED PROOFS 3-6

through deviancy training3 or other processes of negative peer influence (Dishion and Tipsord, 2011). Negative peer influence can be minimized in both structured (i.e., programs) and unstructured (i.e., natural) settings through the presence of supportive adults and positive parenting (Dishion and Tipsord, 2011). The transition from elementary school to middle school during this period has also been associated with decreased academic achievement (Kurtz-Costes and Rowley, 2012; Ryan et al., 2013) and declines in self-esteem and self-worth (Ryan et al., 2013; Wigfield et al., 1991). Declines in the intrinsic value of schoolwork and achievement goals within the last year of elementary school also suggest a possible developmental trajectory during early adolescence that is not solely dependent on the school transition (Ryan et al., 2013; Shim et al., 2008). Research on youth in out-of-school programs during early adolescence contributes to our understanding of how summer programming may support youth during this developmental period. One randomized controlled study of after-school programs for middle school students at five underperforming schools found that unsupervised socializing was associated with increased drug use and delinquency (Cross et al., 2009). Yet the after-school program itself showed only small effects on these risk-taking and antisocial behaviors. Although after-school and summer programs have the potential to fill otherwise unsupervised time, it appears that the programs in this study were not attracting students who would otherwise be unsupervised and therefore be at higher risk for delinquency. Further, attendance was highly variable. The authors conclude that out-of-school programs need to more intentionally create programs for and recruit those youth who are at highest risk of unsupervised socializing. Related to the last finding, research on a representative sample of middle schoolers in Sweden found that participation in highly structured programs was associated with lower levels of antisocial behavior. It also found, that youth participants in programs with little structure tended to have peers who were older, had lower academic achievement, and a record of engaging in more delinquent behaviors (Mahoney and Stattin, 2000). Further, for youth at risk of delinquency and antisocial behavior, a longitudinal study of youth from five communities in the southeastern United States found that participation along with their friends in extracurricular activities was a protective factor, meaning that those youth who joined extracurricular activities were less likely than their peers to drop out of school or be arrested (Mahoney, 2000). In a study of a diverse group of 5th graders from 13 states (Lerner et al., 2005), researchers verified the relationship between five youth factors—Confidence, Competence, Character, Caring, and Connection (i.e., the “5 C’s”)—and the construct of Positive Youth Development (PYD), a term frequently used in the youth development field but previously unsubstantiated empirically. These 5 C’s were found to produce a sixth C: youth Contribution to self, family, community, and society. Among these early adolescents, the study found that participation in youth development programs was associated with higher levels of PYD and Contribution. Youth development programs, including summer programs, may have both promotive and preventative effects for early adolescents, but the recruitment of and attendance or participation by those youth who may be in greatest need of supportive and structured environments is key. At the same time, programs must be cognizant of potential contagion 3 Deviancy training “involves the interpersonal dynamic of mutual influence during which youth respond positively to deviant talk and behavior…the deviancy training process is characterized by give-and-take exchanges between friends that promote deviant actions (e.g., past stories of deviant acts, suggestions for future behavior, what ifs) and elicit positive responses, such as laughter.” (Dishion and Tipsord, 2011). PREPUBLICATION COPY, UNCORRECTED PROOFS 3-7

effects when serving youth who are engaging in or at risk of engaging in behaviors that are risk- taking (e.g., substance use, unprotected sexual activity) and antisocial (e.g., aggression, delinquency). Programs can guard against such effects by ensuring appropriate levels of structure and adult monitoring and support (Dishion and Tipsord, 2011). Middle to Late Adolescence In middle and later adolescence, the rapid changes that have been occurring in the youth’s physiological, neurological, biological, and emotional systems are coming into balance. During these years, adolescents are concerned with exploring and forming a coherent sense of their own identities and thinking about their values, beliefs, and purpose in life, and they tend to demonstrate more goal-directed behavior and a desire for increased autonomy (Nagaoka et al., 2015). Cognitive advances mean that across middle and late adolescence youth are more able to integrate and understand differences in their own sense of self across different relationships and contexts (National Academies of Sciences, Engineering, and Medicine, 2019a). Settings and relationships that provide them with a sense of physical and psychological safety and belonging, opportunities for autonomy, intellectual challenge, and clear and culturally responsive norms and expectations can support adolescents’ capacities for self-regulation, independence, and decision making (Eccles and Roeser, 2011; Geisz and Nakashian, 2016; Gestsdottir and Lerner, 2008; Scales et al., 2011; Siegel, 2013). During middle and late adolescence, youth are also considering their place in the world and their aspirations for life after high school as it relates to postsecondary education, skill development, and work and career possibilities. Opportunities for adolescents to contribute to their communities and critically consider the social world can support their identity and sociopolitical development (Watts and Guessous, 2006; Watts et al., 2011) and provide culturally relevant and meaningful experiences (Harper et al., 2018c). During middle and late adolescence, youth still have heightened sensitivity to peer influence and social belonging, yet as adolescents age their peers may become less important to their own self-evaluations (National Academies of Sciences, Engineering, and Medicine, 2019). Further, both parents and nonparental adults (e.g., teachers, coaches, mentors) continue to provide important support for healthy identity development and autonomy seeking (National Academies of Sciences, Engineering, and Medicine, 2019). As with the literature on early adolescence, research on the role of out-of-school programs in middle to late adolescence is helpful in thinking about the ways in which summer programs can support youth during this developmental period. As noted earlier, participation in out-of-school programs during adolescence may reduce risk-taking and antisocial behavior in both adolescence and young adulthood, especially for those youth experiencing the most risk factors (Mahoney, 2000). Additional research corroborates these findings and suggests that activity participation during middle and late adolescence may have both preventative and promotive effects. For example, one longitudinal study of adolescents in grades 7–12 drawn from the Childhood and Beyond4 study sample (Fredericks and Eccles, 2006) found that the 4 The Childhood and Beyond (CAB) project is a study of students' achievement and learning experiences from kindergarten through grade 12. The project began in 1987 and has conducted surveys and interviews with children and parents for over 30 years. They cover a broad range of activities, behaviors and beliefs. For more information on the Childhood and Beyond (CAB) project see here http://garp.education.uci.edu/cab.html. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-8

duration (i.e., number of years) of involvement in extracurricular activities was associated with several positive developmental outcomes, including improvements in grades and psychological resilience. Further, for older adolescents, participation in extracurricular activities was associated with academic adjustment and psychosocial competencies. It should be noted that the sample in this study was majority-White, came from four school districts in Michigan, and was specifically chosen from districts where family and neighborhood factors were unlikely to pose a barrier to afterschool activity participation, making it difficult to generalize the findings to youth growing up in neighborhoods characterized by higher levels of poverty and other environmental barriers. Another longitudinal study of mostly White youth (n = 1259) from 10 school districts in working- and middle-class communities in Michigan (Eccles et al., 2003) found that activity participation in 10th grade had both promotive and preventative effects on several academic, occupational, and behavioral outcomes. Participation in a variety of types of activities, such asperforming arts, prosocial activities, academic activities, clubs, or sports, had a positive impact across high school and into young adulthood. Yet participation in sports also had a potential negative affect, with athletes reporting higher levels of drinking in 12th grade in addition to positive educational and employment outcomes during high school and early adulthood. As with childhood, during adolescence summer programming can offer important opportunities for youth to assert autonomy in their choice of activities, which itself is an important developmental task during this period. Further, summer can provide critical unstructured time that may counterbalance the stress of the academic year for students. Importantly, however, unstructured here does not mean wholly unsupervised, as unsupervised time is linked to increased engagement in risk-taking and antisocial behaviors, as noted throughout this chapter. HOW DOES SUMMER AFFECT DEVELOPMENTAL TRAJECTORIES? The committee found little systematic research concerning the impact of summer on the developmental trajectories of school-age children and youth across all four areas of well-being. In most cases, what we were able to find were sources of data pointing to seasonal differences in the rates of incidence. We identified far more information on how summer influences academic learning and obesity relative to other developmental outcomes of interest. It is also important to note that a number of the gaps in developmental outcomes between children and youth from higher and lower socioeconomic backgrounds and from different racial and ethnic groups are present before school entry, including gaps in the academic, social-emotional, and health domains. Thus, it must be acknowledged that it may be challenging for a single, stand-alone summer program to redress such gaps. In the following, for each of the four domains we provide data and research on what is known about how summer influences these areas. Where no summer-specific information exists, we also look to what is known about out-of-school time generally (which includes summer and after school) that may be applicable to summer as well. Safety and Pro- and Anti-social Behaviors As highlighted by the sections above, safety is foundational to physical and psychological health, well-being, and healthy development. We know that appropriate supervision is a key condition to ensure the safety of children and youth (Persson et al., 2007). Indeed, being PREPUBLICATION COPY, UNCORRECTED PROOFS 3-9

unsupervised during out-of-school hours is associated with significant risks (Resiner et al., 2007). Summer is a potentially risky time for youth in that the amount of unsupervised time may be greater during the summer months than during the school year. While safety does not have developmental trends, per se, the characteristics of safe environments that are needed to support healthy development change as children’s motor, cognitive, and social skills develop. As such, some risks to safety are inextricably linked to other characteristics associated with children’s physical, psychological, cognitive, and social development. We next discuss three key areas where we identified evidence of seasonal differences in relation to this domain: crime, pro- and anti-social behaviors, and substance use. Whereas we separate these areas for this discussion, there is some overlap. Certain risks to safety (e.g., peer victimization, exposure to violent crime) can result from other youths’ antisocial behaviors. Further, substance use, generally defined as a risk-taking behavior, is also an act of delinquency, because youth are under the legal age for use even for substances that are legal for adults. Crime Seasonal patterns of crime exist and persist, despite overall reductions in crime over time. A study tracking violent and household property crimes from 1993 to 2010 found that victimization rates were higher during the summer than during any other season for most crimes, including household property crimes and violent crimes, with the exception of robbery and simple assault. However, among youth ages 12 to 17, simple assault victimization rates were lowest during the summer, starting when the school year ended, and were highest in the fall when the school year began, suggesting that violence may be occurring en route to or during school. (Lauritsen and White, 2014). Exposure to violent crime can damage children’s health and development (Osofsky, 1999), and it should be noted that juvenile crime also has implications for the youth who are the potential victims of it—when crime rates increase, so does the risk of victimization. Children and youth in low-income families and those in neighborhoods with concentrated disadvantage are affected by violent crime at higher rates than others. A recent report, using data from the National Crime Victimization Survey, found that people in households below the federal poverty level experienced more than double the rate of violent victimization as high-income households (Harrell et al., 2014). Neighborhoods with more concentrated disadvantage and greater segregation by race and ethnicity tend to experience higher levels of violent crime (U.S. Department of Housing and Urban Development, Office of Policy Research and Development, 2016). Overall engagement in delinquency, defined by the U.S. Department of Justice’s Office of Juvenile Justice and Delinquency Prevention as “an act committed by a juvenile that would be criminal if committed by an adult” (Office of Juvenile Justice and Delinquency Prevention, 2019), typically increases from childhood to adolescence. Rates then decline with age, even for persistent offenders, with peaks in adolescence or during young to middle adulthood for different types of offenses (Sampson and Laub, 2003). National trends show that rates of juvenile crime and violence-related behaviors, such as carrying a weapon or being in or being injured in a fight, have declined overall since 1990 (Arnett, 2018). Yet patterns of crime associated with in-school versus out-of-school hours also differ by type of crime. One study found that property crimes increased by 14 percent in days when school was not in session, suggesting an increase in antisocial behavior when youth are unsupervised; it PREPUBLICATION COPY, UNCORRECTED PROOFS 3-10

found further that violent crimes increased by 28 percent on school days, suggesting that opportunities for youth to interact with each other are linked to juvenile violence (Jacob and Lefgren, 2003). Violent crime peaks in the after-school hours on school days and in evenings on nonschool days (Jacob and Lefgren, 2003). Although most of what is known about the relationship of policing or police interactions to health and well-being has been based on adult experiences (although see Legewie and Fagan, 2018), the salience of adolescence as a critical developmental stage (Steinberg, 2014) suggests that experiences with the police may be particularly influential at younger ages and among school-age youth. Police interaction with youth have increased in recent decades due to their increase in schools (National Academies of Science, Engineering, and Medicine, 2019a). Negative interactions between police and youth “may produce cynicism and undermine legal socialization” (National Research Council, 2013, p. 194). Police are increasingly recognized as a significant social force shaping the development and well-being of youth, yet much remains to be learned about police-youth interactions at a population level. These unknowns include our currently limited understanding of how the unique context of summertime, and the associated time that students have off from school, may shape interactions between young people and the police (Geller, 2019). Pro-and Anti-social Behaviors Both prosocial behaviors, those aimed at helping others (Eisenberg and Spinrad, 2014), and antisocial behaviors, such as aggression and delinquency, skipping school, and lying (Light et al., 2013) demonstrate some developmental and seasonal trends. Prosocial behaviors appear to increase from early childhood into elementary school (Eisenberg and Spinrad, 2014). However, varying trajectories of prosocial behavior from childhood into and through adolescence have been documented (Eisenberg and Spinrad, 2014). Some report a decline in the positive behaviors associated with social emotional and character development from middle childhood into adolescence, despite increased cognitive abilities that should, in theory, lead to increased moral reasoning and thereby prosocial behaviors (Luengo Kanacri et al., 2013; Washburn et al., 2011). Others have documented increases or stability in prosocial behavior into and across adolescence (Eisenberg and Spinrad, 2014). Thus, different developmental patterns of prosocial trajectories have been found, yet overall, with some exceptions for particular types of behavior, prosocial behavior appears to decrease in early adolescence but then increase again in late adolescence (Eisenberg and Spinrad, 2014). Concurrently, increases in antisocial behaviors have been documented from ages 12 to 16 (Jessor and Jessor, 1977; Loeber and Burke, 2011; Nagin and Tremblay, 1999; Patterson and Yoerger, 2002; all as cited by Light et al., 2013). General patterns of antisocial behavior demonstrate that the vast majority of individuals desist from such behaviors in adulthood. Rates of antisocial behavior (i.e., arrests, delinquency) tend to increase across early to middle adolescence. These rates peak in late adolescence, and then decline; while for a smaller group of individuals—who have often tended to show earlier, more frequent, and more extreme antisocial behavior—antisocial behavior persists into and through adulthood (Moffitt, 1993). In terms of seasonal patterns, in a longitudinal study of students (n=5,742) from 11 rural and suburban middle schools across the western United States, Light and colleagues (2013) found decreases in antisocial behavior during each school year across grades 6–8, with increases between school years. The researchers could not conclusively say whether the increase in PREPUBLICATION COPY, UNCORRECTED PROOFS 3-11

antisocial behavior that marked the beginning of the school year occurred over the summer or at the start of school year, or both. In a study of students (n=5,581) from 37 middle schools across four communities, in which all the schools served a high proportion of students on free or reduced lunch, Farrell and colleagues (2011) found the opposite pattern for aggression. In this study, aggression demonstrated increases during the school year from sixth to seventh grade, but both physical and relational aggression decreased during the summers throughout the middle school years. They hypothesized that the pattern found by Light and colleagues (2013) was due to the start of the school year, because students attempt to re-establish peer social hierarchies after the summer. This research is consistent with crime statistics reported earlier, which find reduced rates of assault victimization for youth during the summer. As noted earlier, participation in after-school activities may be protective for youth at high risk of engagement in antisocial behaviors. Mahoney and Cairns (1997), in a longitudinal study of students (n=392) from two middle schools that followed students into high school, documented that participation in an extracurricular activity was protective for students with the highest risk for school dropout. Mahoney (2000) then found that participation in extracurricular activity was associated with decreased school dropout and arrests among youth with multiple risk factors. Importantly, this depended on others in the youth’s peer group also participating in activities. In another study by Martin and colleagues (2007), Black males between the ages of 13 and 17 who had previously been expelled or suspended from school showed improved school attendance and academic skills and a reduction in disciplinary actions after attending a five-day- a-week after-school program for two years. Of note, the program comprised a variety of components including tutoring, cultural and recreational activities, and nutritious meals. As discussed later in Chapter 5, youth involved in the juvenile justice system and other youth considered at risk for antisocial behaviors can benefit from programming that supports their needs for skills that help them transition to adulthood (Ananthakrishnan, 2019). Substance Use National trend data reveal steady declines in adolescent substance use, including alcohol and cigarettes, between 1990 and 2017 (Arnett, 2018). Rates of drug use differ, with rates of marijuana use fluctuating over the years and rates of other drug use increasing in the 1990s and declining since then (Arnett, 2018). Use of e-cigarettes has increased in recent years for both middle school and high school age adolescents (Cullen, et al, 2019). Among youth, substance use, including use of alcohol, cigarettes, and drugs, generally increases from early to late adolescence (e.g., Farrell, et al 2005; Warren et al., 2016). Whereas we might expect substance use to increase during the summer, when adolescents may have more unsupervised time, the evidence is complicated. The National Survey on Drug Use and Health found that first-time use of alcohol, tobacco, marijuana, hallucinogens, and inhalants peaks in June and July (Substance Abuse and Mental Health Services Administration, 2012). However, a national survey examining overall past-month use of illicit substances found that past-month use of any illicit drug except marijuana is lower during the period when most students are on summer vacation and that fewer adolescents reported being approached by drug dealers in the summer than during other times of the year. However, alcohol use was higher in July (along with holidays and winter recess) than at other times of the year (Huang and Schildhaus, 1999). Similarly, one study of middle school students at three urban public middle schools serving a PREPUBLICATION COPY, UNCORRECTED PROOFS 3-12

predominantly Black student population from low-income families (Farrell et al., 2017) found that substance use decreases in the summers from grades 6 to 8. Physical and Mental Health Whereas there has not been much research focus on the relationship between children’s summertime experiences and their overall physical and mental health trajectories, there are several common health conditions in children where seasonality is known to play a role. There are also particular circumstances that children experience during summertime that may affect physical and mental health outcomes. In addition, the extent to which youth are managing an ongoing or emergent health issue can impact their engagement in summertime opportunities. The three most common causes of mortality among children ages 5 to 14 are unintentional injuries, cancer, and suicide (Kochanek et al., 2019). The three most common causes of mortality for adolescents and youth ages 15 to 19 are unintentional injuries, suicide, and homicide (Heron, 2019). A study of the 10 leading causes of death and injury in the United States from 1980 to 2016 found a distinct seasonal pattern of mortality from unintended injuries in males ages 5 to 14 that was similar across all regions (Parks et al., 2018). Seasonal variation also has been reported in common childhood conditions, including asthma, obesity, and mental and behavioral health conditions. Injuries Physical activity-related trauma, such as sprains, fractures, and contusions, sustained while engaging in sports or recreational activities is a primary cause of summertime pediatric injuries in western countries (Jespersen et al., 2014). A study in the United States of temporal variation in injuries associated with seven common recreational activities in children under 18 examined emergency room visits logged into the National Electronic Injury Surveillance System (NEISS) between 2002 and 2006. It found that emergency room visits peaked in June for injuries from trampolines and scooters and in July for injuries from cycling and water activities. Injuries related to skating and playground activities peaked in April and September (Loder and Abrams, 2011). A significant increase in the number of fractures has been reported during the summer, peaking in July with injuries occurring on playgrounds, trampolines, bicycles, and all-terrain vehicles (Farnsworth et al., 1998). A study of childhood trauma from injury found a similar pattern, with the highest number of childhood trauma victims seen in the emergency room in July, and twice as many children admitted from May to August as were admitted from November to February (Keenan and Bratton, 2002). A retrospective study of children (mean age of 5.9 years) with humeral fractures requiring surgery in Indiana also documented a significant increase in fractures in the summer, peaking in early July, with injuries occurring from playground equipment, furniture, climbing activities, sports, trampolines, bicycles, and all-terrain vehicles (Loder et al., 2012). Injuries from moped accidents in the United States were twice as common in youth under 18 than adults in the summer, with the highest frequency in youth ages 14 to 18 (Johnson et al., 2017). Drowning is the leading cause of death by unintentional injury in children ages 1–4 and the second leading cause of death by unintentional injury in children ages 5–9 (CDC, 2017). Whereas children who drown between ages 1 and 4 tend to drown in swimming pools, hot tubs, or spas, older children and adolescents who drown tend to do so in outdoor natural water settings. Males and Black PREPUBLICATION COPY, UNCORRECTED PROOFS 3-13

children have higher rates of drowning. Swimming skills are associated with reduced rates of drowning. More Blacks report limited swimming skills than Whites, which may account for the disparity in rates of drowning (Gilchrist and Parker, 2014; Irwin et al., 2009). In a study of adolescents over age 16, reasons for higher rates of drowning among males than females were swimming in high-risk situations, overestimation of swimming ability, and use of alcohol while swimming (Howland et al., 1996). A study of heat-related injuries in Florida found that the rate of non-work-related emergency room visits was highest for adolescents ages 15–19 (60.41 per 100,000 person-years) and that the rate decreased as age increased, while the lowest rate of non-work-related heat- related injuries was among children under age 10 (9.83 per 100,000 person-years). However, the highest heat-related-injury death rates were for the elderly and those under age five (Moreno et al. 2016). Asthma In the northern hemisphere, asthma episodes peak in the early fall, a trend hypothesized to be due to respiratory viruses (Johnston and Sears, 2006). However, this peak varies by geographic region in the United States, where it ranges from early fall to early spring (Wisniewski et al., 2016). In a 16-year study of prescription fill rates for asthma medication, the lowest fill rates were found to be in the summer months, increasing in the autumn and through the winter, suggesting that prescription filling is reactive and follows disease exacerbation (Turi et al., 2018). However, deaths from asthma are more common in the summer months (Weiss, 1990; Campbell et al., 1997). Obesity Numerous studies have found an increase of childhood obesity in the summer. An analysis from the Early Childhood Longitudinal Study of body-mass index (BMI) measurements at the beginning and end of kindergarten and first grade showed that BMI increases more rapidly and more variably during the summer than during the school year. The same study found that the disparities in obesity prevalence between Black or Hispanic children and White children were largely due to increases in their BMI during the summer (von Hippel et al., 2007). In 2016, von Hippel and colleagues published an updated study, which found a similar gain in summertime BMI. However, this second study found no significant differences in summer weight gain by race or ethnicity. There were also no differences in summer weight gain between boys and girls, between children based on their families’ higher vs. lower incomes, or between children based on maternal education or employment status (von Hippel and Workman, 2016). Similarly, in a five-year longitudinal study conducted in southeast Texas, children generally lost weight during the school year and gained weight during the summer without any racial or ethnic variation (Moreno et al., 2013). However, other studies have found that summer affects childhood obesity differentially across groups of children and youth. Children who are in the highest BMI percentiles have been found to gain significantly more weight during the summer than children in lower BMI percentiles (Downey and Boughton, 2007), placing children with severe obesity at the greatest risk for summer weight gain. One study of third-, fourth-, fifth-, seventh-, and eighth-grade American Indian school children found that those who were at or above the 85th percentile for PREPUBLICATION COPY, UNCORRECTED PROOFS 3-14

BMI experienced an increase in BMI during the summer, while for children below the 85th percentile there was no change (Smith et al., 2009). However, another study of American Indian children between kindergarten and first grade found no change in the velocity of BMI increase in the summer as compared to the school year (Zhang et al., 2011). Various explanations have been advanced to account for increased weight gain among children and adolescents in summertime. Factors that have been proposed include decreased physical activity and increased sedentary behaviors, poorer nutrition, and lack of access to school interventions. We discuss these factors below, many of which disproportionately affect children and youth in disadvantaged neighborhoods. Many of these factors fit within the “structured day” hypothesis (Brazendale et al., 2017). During the school year, children and adolescents generally experience a more highly structured, consistent, compulsory, and supervised day than in the summer. During the summer, there may be greater nutritional, activity, and sedentary activity choices and more discretionary time to engage in media use and alter sleep times (Avery et al. 2014). In one study, adolescents who regularly participated in organized activities were at less risk for obesity than those who did not (Mahoney, 2010). Physical activity and sedentary behavior. A review of the research on seasonal variation and physical activity among children and youth by Carson and Spence (2010) suggests that summer may be associated with increased physical activity for some children and youth in certain contexts, but the evidence is mixed. Furthermore, the relationship between seasonality and physical activity may vary based on geography, urbanicity, and climate. For example. rural youth may be more active than urban youth in summer (Carson and Spence, 2010). Lower physical activity and increased sedentary time in the winter have been found across all ages, ethnicities, and climates (Atkin et al., 2016; Kornides et al., 2018; Stalsberg and Pederson, 2010). Atkins and colleagues (2015) analyzed seasonal accelerometer data from 705 seven-year-olds in the Millenium Cohort Study in the United Kingdom and found that in all children moderately vigorous physical activity (MVPA) was lower in autumn and winter compared with spring. In summer, MVPA was lower in summer compared with spring in boys, children of normal weight, those living in urban areas, those from high-income families, and on weekends. Sedentary time was greater in autumn and winter than in spring, and the seasonal effect was stronger during the weekend. Relative to spring, sedentary time in summer was lower on weekdays but higher during the weekend. Summer seems to be a time when activity and sedentary behavior are more variable between groups and during the week when compared to the school year (Atkin et al., 2015). No matter what the season, adolescents are not meeting daily physical activity requirements. A prospective study of self-reported activity in adolescents (Kornides et al., 2018) found that 85 percent of adolescents did not meet the recommendation for MVPA (recommendation of 4 hours/week) and 91 percent did not meet the recommendation for vigorous physical activity (VPA; recommendation of 3 hours/week) for one or more seasons over the four study years. However, they were more likely to meet the MVPA requirements during the summer than in the winter. Even so, 60 percent of adolescents did not meet the moderate to vigorous physical activity requirements in the summer. Those least likely to meet these physical activity requirements were females, adolescents who had overweight or obesity, and older adolescents. When they compare the school year as a whole versus summer, many studies find a lower percentage of light-intensity physical activity and greater sedentary time, screen time, and sleep time during summer compared to the school year (Brazendale et al., 2018). PREPUBLICATION COPY, UNCORRECTED PROOFS 3-15

Zinkel and colleagues (2013) studied 162 school-age, sedentary Black and White youth based in or near the District of Columbia who were at-risk for adult obesity to assess the potential impact of seasonal differences in total energy expenditure (TEE) on summer weight gain. When total and resting energy expenditure were measured throughout the year, no differences in energy expenditure were detected between summer and the school year, and the authors suggested that increased calorie intake through food and drinks may be the primary driver of summer weight gain (Zinkel et al., 2013). Nutrition. Children and youth ages 6 to 19 engage in higher consumption of sugar- sweetened beverages and slightly lower intake of vegetables during school break, according to an analysis of the National Health and Nutrition Examination Survey (NHANES)5 2003–2008. Consumption of sugar-sweetened beverages and added sugar was higher for males, higher on weekends, and higher for older children (Wang et al., 2015). Another study found that consumption of sugar from more fruits, sweets, and desserts during summer resulted in an unhealthier high-sugar intake during the season (Brazendale et al., 2018). BOX 3-3 Food Insecurity in the Summer Food insecurity increases in the summer for children (Gordon et al., 2017). The U.S. Department of Agriculture’s (USDA) Summer Food Service Program (SFSP), also known as the Summer Meals Program, is a state-administered program that provides children and teens (ages 18 and younger) in low-income areas free meals when school is out. In 2014, 84 percent of students who received free and reduced-price meals during the school year did not receive meals from the SFSP or other summer nutrition programs run by the USDA (Food Research and Action Center, 2018). Fewer than one-third of SFSP sites are in rural areas. Income requirements, low population density, and the low availability of transportation to the sites pose challenges to the establishment of SFSP sites in these areas (Hopkin et al., 2017; Wauchope and Stracuzzi, 2010; U.S. Department of Agriculture 1998, 2008). The U.S. Department of Agriculture’s summer meals programs, including the SFSP, may be effective at reducing the most severe form of food insecurity for low-income households with children. Expanding the number of summer meals sites, the number of meals served at sites, and sites’ hours of operation may be effective strategies to promote nutritional health over the summer months (Miller, 2016). Many communities provide other types of food assistance and child-centered programs during the summer months to meet the nutritional needs of low-income children, but locations and resources are limited, leaving gaps in access to food during the summer for low-income children and resulting in very low food security among children (Collins et al., 2016). To address this gap, the U.S. Department of Agriculture piloted the Summer Electronic Benefit 5 The NHANES is a series of multicluster cross-section surveys conducted by the Centers for Disease Control and Prevention that are representative of the noninstitutionalized U.S. population. For more information, see here: https://www.cdc.gov/nchs/nhanes/index.htm?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Fnchs%2Fnhan es.htm. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-16

Transfer for Children (SEBTC) demonstration. The goal of SEBTC was to provide nutritional assistance for low-income children during the summer when free or reduced-price meals are inaccessible. The SEBTC program distributes assistance to households with eligible school- age children using electronic benefit systems (EBT) cards. The program provides a way for families to reduce summer food insecurity and improve diet quality and nutrition—especially in communities that have challenges in accessing summer meal sites (USDA, 2013). Implementation demonstrations of SEBTC, have shown an increase among participants in consumption of fruits and vegetables, whole grains, and dairy products (Collins et al., 2016). Additionally, program had high rates of participation, with more than 75 percent of families redeeming some or all of their benefits (Food Research and Action Center, 2018). SOURCE: Compiled by the Committee on Summertime Experiences and Child and Adolescent Education, Health, and Safety. Disruption of school interventions. School-based interventions for obesity have been successful during the school year (Wang et al., 2015), but improvements in fitness, metabolic status, and percentage of body fat have been found to be reversed during the summer, with measurements returning to pre-intervention levels by the beginning of the next school year (Carrel et al., 2007). A small study of children in rural Wisconsin whose BMI was above the 95th percentile showed that positive results of a school-based obesity intervention (improvements in percent body fat, cardiovascular fitness, and fasting insulin) were lost during the summer break (Carrel et al., 2007). In two studies of school-based fitness interventions, improvements in fitness and body composition were lost during the summer (Gutin et al., 2008; Yin et al., 2012). In a two-year community intervention involving more than 1,000 children in grades 1 to 3, BMIz6 decreased in children in the intervention community compared to children in the control groups. The next summer, when the when the intervention was less intense, there was no change in the BMIz scores between the intervention and control groups, possibly indicating a dose response effect (Economos et al., 2013). Thus, it appears that interventions being continued into the summer may be important for maintaining obesity-related outcomes. Neighborhood Characteristics, physical activity, and weight gain. Although the associations between neighborhood characteristics and obesity in childhood are largely inconclusive, it is possible that neighborhood characteristics may influence children’s physical activity and eating during the summer in particular ways. High-poverty neighborhoods often lack basic infrastructure, with substandard housing stock, more abandoned and boarded-up buildings, inadequate municipal services, fewer retail facilities (e.g., supermarkets), more bars and taverns (Evans, 2004), and high levels of joblessness and crime, especially violent crime (Meade, 2014). Confronted with such conditions, many parents in distressed neighborhoods shield their children from the streets by limiting their outdoor time (e.g., DeLuca et al., 2012). One result is that between birth and age six, children from higher-income families spend an average of 1,300 more hours in “novel contexts”—meaning contexts other than home, school, or in the care of another parent or a day care provider—than do children from lower-income families (Phillips, 2011, p. 207). A study of the link between neighborhood environments and weight gain in predominantly Black elementary-school-age children from lower-income families in Florida 6 BMIz = Body Mass Index z-score.  PREPUBLICATION COPY, UNCORRECTED PROOFS 3-17

demonstrated that females and older children gained more weight in the summer compared to males and younger children. These patterns did not vary by race with respect to summer weight gain. As in other studies, children who were overweight or had obesity gained more weight in the summer than children with normal weight. A study of almost 3,000 children in a midsized city in the South showed that overweight children living near two or more small grocery stores gained less weight than overweight children who lived near just one or no stores; whereas whether or not the children lived within one mile of an active park was not associated with summer weight gain (Miles et al., 2018). Another study found that a lack of neighborhood safety is associated with a small reduction (8 minutes/week) in physical activity and a small BMI gain that did not change obesity status (An et al., 2017). Mental Health The only data regarding seasonal variations in mental health we identified involved mental health emergency visits. Emergency department (ED) data show fewer mental health– related emergency visits in the summer than in other seasons. Data from more than 20,000 children under age 17 in Alberta, Canada, from 2002 to 2008 document decreased presentations to EDs in urban and rural areas throughout Alberta for mental illness, substance use, or intentional self-harm in the summer. Visits for neurotic/stress-related disorders, mood disorders, intentional self-harm, substance abuse, and behavioral/emotional disorders decreased from May to July and then increased in August, September, and October (Ali et al., 2012). A retrospective study of psychiatric ED visits of children and youth ages 5 to 18 to a hospital in upstate South Carolina also demonstrated this seasonal pattern, with less frequent visits occurring in June, July, and August. The top reasons for admissions defined as mental health visits during the five-year study period were aggressive behaviors (68%) and thoughts/actions of self-harm (27%); and the most common diagnoses were anxiety disorders (28%), disorders first usually diagnosed in infancy, childhood or adolescence (27%), mood disorders (19%) and substance-related disorders (10%) (Holder et al., 2017). One review of the Nationwide Emergency Sample Department database (the largest all- payer ED database in the United States) examined suicide attempt–related ED visits from 2006 to 2013 for persons age 10 and over, and found that such visits peaked for females ages 15–19 and males ages 20–24. Visits for attempted suicide were highest in the spring and fall. The largest number of visits occurred in May, and they were more common among persons in the lower-income quartiles (Canner et al., 2018). During an eight-year study of suicide ideation and suicide attempts in children, the lowest frequency occurred in the summer months, with the highest peaks in fall and spring (Plemmons et al., 2018). Social and Emotional Skill Development Social and emotional skill development, frequently referred to as social and emotional learning (SEL), has received increased attention over the past two decades in both school and out-of-school settings. Social and emotional skills include aspects of understanding and managing one’s own emotions as well as the social world, that is, both inter- and intra-personal competencies (Durlak et al., 2011; Elias et al., 1997; Greenberg and Weissberg, 2018; Weissberg et al., 2015). These skills help children and youth integrate their cognition, affect, and behavior (Weissberg et al., 2015). Although the category of SEL is frequently used broadly, individuals PREPUBLICATION COPY, UNCORRECTED PROOFS 3-18

can have relative strengths and weaknesses among the various social and emotional skills. There are also important critiques of social and emotional learning from a lens of culture and equity (Jagers et al., 2018), discussed below, which underscore the importance of thinking about how these competencies are defined, what cultural biases those definitions may reflect, and the impact of that on populations of children and youth from different cultural backgrounds. Developmental Trajectories of Social and Emotional Skill Development Some researchers have examined seasonal patterns of antisocial behavior (discussed earlier; e.g., Light et al., 2013), but trends in the development of positive social and emotional competencies are not well understood. Differences between children in SEL-related competencies are already evident at kindergarten entry (Greenberg and Weissberg, 2018), which may give some indication, at least in early childhood, of the impact of out-of-school environments on social and emotional skills. Specifically, youth from families who are lower on the socioeconomic ladder and youth from disadvantaged racial and ethnic minority backgrounds tend to be assessed by teachers as having lower levels of social and emotional development in early childhood (Halle et al., 2009). In an analysis of the nationally representative Early Childhood Longitudinal Study-Kindergarten Cohort (ECLS-K), Downey and colleagues (2019) documented income and Black-White gaps in teacher-assessed social and behavioral skills at kindergarten entry, and found that these gaps grew slightly between kindergarten and the end of second grade. They found no seasonal patterns, with gaps remaining consistent during the school year and over the summer. Additional analyses of these data revealed gender gaps in social and behavioral skills (approaches to learning, self-control, and interpersonal skills) as assessed by teachers at kindergarten entry, with girls seen as entering school with more of these skills than boys. This gap between boys and girls continued to grow from kindergarten to the end of fifth grade (DiPrete and Jennings, 2012). Whereas DiPrete and Jennings (2012) also found gaps in these skills by family income and by racial-ethnic background, the gender gap was larger than either of those gaps in kindergarten and continued to widen through fifth grade. The intersectionality of identities (e.g., gender and race) may be particularly important to consider in relation to teacher perceptions of social and emotional skills, as one study suggested that teachers monitor the behavior of Black boys more closely when they expect challenging behaviors (Gilliam et al., 2016). One challenge with documenting the developmental trajectories of social and emotional skills is the limitation of current measurement approaches. The number of different definitions of social and emotional skills and learning, noted earlier, weak psychometric properties of the measures used, and differences in methods of assessment (self-report, observation, behavioral ratings, direct assessment) all limit the ability of the field to draw strong conclusions about the developmental properties of these skills (Card, 2017; Jones et al., 2016; McKown, 2017a, 2017b). It has been recommended that a strengths-based and low-stakes approach be taken to the measurement of social and emotional learning and skills. That is, rather than tying SEL assessments to accountability or decision making, it has been recommended to use them as feedback and to identify optimal ways of adjusting instruction to meet the needs of students. Along with this, it has been recommended to place a focus on formative assessment and implementation improvement (Taylor et al., 2018). PREPUBLICATION COPY, UNCORRECTED PROOFS 3-19

It is important to recognize that current conceptual definitions of social and emotional skills reflect the cultural norms and biases of the dominant cultural group engaged in the research and education fields: Whites of middle- to upper-class backgrounds (Deutsch, 2017; Jagers et al., 2018). This bias can also impact how adults perceive social and emotional skills in youth, which can in turn affect measurement of SEL. For example, well documented discipline disparities in schools (see Gregory et al., 2017; Okonofua et al., 2016) suggest that teachers view the same behavior differently depending on who is displaying it, with harsher assessments of behavior for Black than for White youth (Carter et al., 2017; Gilliam et al., 2016; Okonofua and Eberhardt, 2015). This bias may then be reflected in teachers’ ratings of social and emotional skills in students, which are often used in studies of social and emotional skills in order to avoid self- report bias. At the same time, there is potential for SEL to redress rather than reify existing inequities if cultural issues are taken seriously. Jagers and colleagues (2018) coined the term “transformative SEL” to center issues such as power, privilege, social justice, discrimination, and self-determination within the field. They provide a thoughtful overview of the opportunities for equity to be addressed within core social and emotional competencies. Academic Learning and Enrichment Optimal academic development for children and youth throughout the school years— from kindergarten through grade 12—would have students move along paths that maximize their scholastic achievement while moderating disparities along lines of race, ethnicity, and family background. More specifically, the goal is that all children achieve at or above grade-level standards in the primary academic subjects at each grade level and be college and/or career ready at the end of high school. Unfortunately, as a nation we fall short of the goal of high achievement equitably distributed across social lines. The achievement gaps that separate students from higher- and lower-income families and those that separate disadvantaged minority students from white students are large and longstanding. At school entry, disparities in a wide range of outcomes and competencies, including both knowledge and skills in areas such as early literacy and self- regulation, already exist between children from different economic and social backgrounds. Thus, it is critical to consider the role of early education in promoting equitable outcomes for children (Institute of Medicine, 2000). Such gaps are not immutable, though, and real progress has been made in some areas. Trend data from the National Assessment of Educational Progress (NAEP) document large declines in the Black-White and Hispanic-White achievement gaps in reading and math over the past 40 years.7 As of 2012, both gaps had narrowed by 30 to 40 percent relative to the levels extant in the early 1970s, with the largest reductions registered during the decade of the 1970s and into the 1980s. Still, large gaps remain, ranging from 0.5 to 0.9 standard deviations across groups, ages, and domains of performance (Stanford Center for Educational Policy Analysis, ND). 7 The NAEP testing program often is referred to as the Nation’s Report Card. Children are tested at ages 9, 13, and 17, most frequently in math, science, reading, and writing. The NAEP testing program began in 1969-1970. In recent years, testing has been done annually, although not all domains are tested each year. Sample sizes for assessments intended to generalize to the nation as a whole range between 10,000 and 20,000. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-20

The picture for family background is different. During the same timeframe that saw racial and ethnic achievement gaps decline appreciably, gaps across family income levels grew wider. In fact, the gap across family income levels now exceeds those across race and ethnicity. Among children born in the 1950s, 1960s, and early 1970s, those at the 10th percentile of family income averaged 0.9 standard deviations below those at the 90th percentile in reading. Today, for children born in the 2000s, the gap stands at 1.25 standard deviations (Reardon, 2013).8 These achievement gaps translate into later attainment gaps in high school graduation rates, college graduation rates, and employment rates (Cahalan et al., 2018; Vilorio, 2016; Economic Policy Institute, 2018). The importance of summertime for the learning opportunities available to young people K–12 outside school will be observed most immediately in markers of academic achievement, but because successes and challenges in school anticipate successes and challenges in college and the workplace any such importance near-term is certain to reverberate longer-term. The remainder of this section examines possible links between summertime experience and academic development. Evidence The question of how summer influences the academic achievement and learning trajectories of children and youth has been studied more than questions regarding other domains. However, these studies do not always agree on precisely how summer influences academic trajectories. Studying the effect of summer is challenging, because schools do not typically test students in the fall and the spring. The seminal research is drawn from smaller, localized studies conducted in the 1970s and 1980s (Alexander et al., 2007; Entwisle and Alexander, 1990, 1992; Heyns, 1978), while more recent literature takes advantage of data from seasonal testing conducted by the national Early Childhood Longitudinal Study Kindergarten Class (K-2), from districts and states using the Northwestern Evaluation Association Measurement MAP Assessments (grades 3-8), and from summer intervention studies that examine summer learning in an experimental/control-group context. Early Studies Summer learning loss—the phenomenon of students forgetting some of what they learned during the school year—was first addressed in 1906, when William White, a teacher of mathematics in New Palz, New York, tested a handful of his 4th and 7th grade students on math facts before and after the summer vacation. Finding that students lost ground over the summer, White observed: “… neglect for three months may blur the memory.”9 Recent studies, more rigorous than White’s, have asked a related question: Is summer learning loss more prevalent among children from lower-income families and among disadvantaged racial and ethnic minority groups than among children of more advantaged backgrounds? This line of research was launched by Barbara Heyns in her landmark study, Summer Learning and the Effects of Schooling (1978). Heyns examined the academic progress of 6th and 7th graders in Atlanta, Georgia, over an 18-month period, comparing school-year test 8 By way of comparison, in Reardon’s (2013) analysis of the Black-White gap for this same age cohort is a bit below 0.75 standard deviations, down from 1.2 standard deviations among children born in the 1950s. 9 Quoted in Pitcock, 2018, p. 5. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-21

score gains against gains over the months bracketed by successive school years (e.g., the summer between sixth and seventh grades). Children from lower-income families and Black children registered achievement gains close to those of their more advantaged counterparts during the school year, but over the summer months they lagged behind. The next study of consequence was the Baltimore-based Beginning School Study (BSS), launched in the fall of 1982. In this research, the reading comprehension achievement gap separating children in lower-income families from children of middle class family background increased from 0.5 grade equivalents in the fall of 1st grade to 3.0 grade equivalents in the spring of 5th grade; similar differentials were found on the math concepts and applications subtest of the California Achievement Test battery (Entwisle et al., 1997). As regards the summer period, the achievement gap increase over this period traced back almost entirely to differences in summer learning, largely to the summers between first and second grade and between second and third grade. Then later, in 9th grade, the first year of high school, two-thirds of the extant reading comprehension gap comparing children from lower-income families against those from middle income families (up to 3.5 grade equivalents at that point) was found to originate in differential summer learning over the elementary school years (Alexander et al., 2007). In 1996, Cooper and colleagues (1996) reviewed the literature on summer learning loss, consisting of 38 studies, 13 of which lent themselves to rigorous quantitative meta-analysis. Learning patterns did vary by season, but they were not uniform across testing domains or student populations. Reading comprehension scores declined overall during the summer, moreso among children from lower-SES backgrounds, while word recognition scores rose among children from middle class backgrounds and declined among children from lower-SES backgrounds. A composite of the reading domains favored upper-SES children over lower-SES children by three months over the summer months, while the Black-White difference was not significant. Regarding math achievement, computation, concepts, and applications were examined separately, and a composite measure of all three was also examined. All children lost ground in math over the summer months (on the order of two months on average), the largest domain- specific loss being for computation. Recent Studies Both Heyns’ study in Atlanta and the BSS research in Baltimore, as well as many of the studies included in Cooper’s literature review, were local studies each limited to a single city. A national perspective is afforded by more recent studies, including the massive database compiled by the Northwest Education Association (NWEA). In the studies cited below, NWEA’s Measures of Academic Progress (MAP) testing program assessed reading and math for nearly 20 percent% of the school-age population in grades 2 through 9 in all 50 states from 2007 – 2008 through 2011 – 2012. Although MAP coverage is not strictly representative, the scope of this project affords a broad-based descriptive account of school-year and summer achievement patterns. MAP data show that learning slows during the summer months relative to the school year at all grade levels in both reading and math, with absolute declines during most summers. And these losses are appreciable, averaging, across grade levels and years, losses of 3 to 4 points against average school year gains of 4 to 16 points. As an example, over the summer following 3rd grade, students lose nearly 20 percent of their school year gains in reading and 27 percent of PREPUBLICATION COPY, UNCORRECTED PROOFS 3-22

their gains in math. For the summer after 7th grade, the respective figures are 36 percent and 50 percent (Kuhfield, 2018b). On the other hand, MAP data also establish that not all students lose ground during the summer. Those who gain the most during the school year tend to lose the most over the summer months (Kuhfield, 2019), while differences by race/ethnicity in patterns of summer gains and losses are small (Kuhfeld, 2018a). The Early Childhood Longitudinal Studies (ECLS-K: 1998-1999 and ECLS-K: 2010- 2011) also afford national perspective, albeit only for the early grades. Like the NWEA data, these are true panel studies in that they monitor the same children’s academic progress over time. One of the first studies to examine summer learning with these data (Downey et al., 2004) found large disparities across lines of family socioeconomic status (but not race/ethnicity) in reading and math gains over the summer between kindergarten and first grade (the only summer period monitored); however, this pattern was not replicated in subsequent analyses of these data using different psychometric methods (von Hippel and Hammock, 2019; von Hippel et al., 2018), while analyses of the more recent ECLS-K: 2010–2011 cohort have yielded mixed results (von Hippel et al., 2018; Quinn et al., 2016). The sections that follow summarize these and other key findings from the research, highlighting areas where we have greater or less certainty. Academic Progress Slows During Summer Months. Research consistently demonstrates that that academic progress slows during the summer months relative to the school year (von Hippel and Hamrock, 2019; Quinn et al., 2016; Entwisle and Alexander, 1992, 1994; Heyns, 1978). The slower rate of academic learning during the summer makes sense, since children and youth are not receiving formal academic instruction during this time. The Direction of Average Academic Progress Is Unclear. The seminal literature examining how summer affects academic achievement found that not only did academic progress slow during the summer months, it also faded. As noted, Cooper and colleagues (1996) found that on average children lose ground academically over the summer months in math and reading comprehension. However, more recent research shows a far less clear picture regarding whether children and youth, on average, are declining, maintaining, or slightly improving academic skills over the summer months. In most studies that find such declines (Atteberry and McEachin, 2019; Borman and Dowling, 2006; White et al., 2013; Workman and Merry, 2019), the magnitude is less than what was found in earlier literature. For instance, Workman and Merry (2019) find that average skills decline approximately 4–6 percent from the prior school year. Other studies find no loss or gain during the summer (Benson and Borman, 2010; McCoach et al., 2006; Ready, 2010; Zvoch and Stevens, 2013), small academic gains during the summer (Burkam et al., 2004; Fitzpatrick et al., 2011), and mixed results for different subjects, with a gain in one subject and no change in another subject (Downey et al., 2004; Hayes and Gershenson, 2016). The Influence of Summer on Academic Trajectories Is Worse for Children and Youth from Lower-Income Families, Communities, and Schools. With few exceptions, research consistently finds evidence of differential outcomes for students based on family income. The seminal work on academic trajectories found higher rates of summer learning loss among children from lower- income families, particularly in reading (Cooper et al., 1996). Recent studies find that children from lower-income families learn less during the summer relative to their wealthier peers even if they do not experience absolute knowledge losses over the summer (Downey et al., 2004; PREPUBLICATION COPY, UNCORRECTED PROOFS 3-23

McCoach et al., 2006; Benson and Borman, 2010; Ready, 2010; Von Hippel et al., 2016; Benson and Borman, 2010; Kim, 2004; White et al., 2013). However, two studies in the early grades do not find differential loss (McCoach et al., 2006; von Hippel et al., 2018) and Gershenson (2014) finds mixed evidence that depends on the subject and model specification. Studies also have found that children and youth living in neighborhoods with high poverty levels (Benson and Borman, 2010) or attending schools with high concentrations of poverty (White et al., 2013; Atteberry and McEachin, 2016) experience larger losses over the summer relative to peers in wealthier neighborhoods or schools. Children from low-income families start kindergarten at a disadvantage, and that disadvantage persists through secondary school. The extent to which summer contributes to the achievement gap is unclear, with earlier research suggesting that it does and more recent studies more mixed in their conclusions. Nonetheless, as structured, the summer months are not helping to close the gap. Racial Differences in Summer Academic Trajectories Appear to Be Driven by Family Income. In the United States, Black and Latinx children and youth are more likely to be from lower-income families than are their White peers. As a result, when researchers examine whether Black and Latinx children have differential rates of learning in the summer compared to their White peers, they can approach the question in two different ways. Studies that examine whether Black and Latinx children unconditionally have differential learning rates (not controlling for SES differences among families) find that they fall behind their White peers over the summer months (Atteberry and McEachin, 2019; Kim, 2004; Quinn, 2014). However, studies that isolate race from family income find that Black and Latinx children have summer learning rates equal to those of their white peers (Benson and Borman, 2010; McCoach et al., 2006; Burkam et al., 2004; Downey et al., 2004). Summary This is a complicated, highly technical literature and therefore difficult to summarize. Quin and Polikoff’s (2017) stock taking and the conclusions that follow from it seem apt: “… summer loss and summer gap-growth occur, although not universally across geography, grade level, or subject.” More specifically: 1. Test score disparities across social lines registered during the years prior to kindergarten exceed those that emerge over the early elementary years (summers and school years combined). 2. Lower-income and minority youth do not always keep pace with their more advantaged counterparts during the school year. 3. Summer learning differences by socioeconomic background and race/ethnicity are not always evident, consistently patterned, or as large as previously thought. Poor children and disadvantaged minority youth enter school already behind, over time those achievement gaps persist, and in some studies they widen. Though we cannot parse with certainly what portion of these gaps and gap increases across social lines trace to the preschool years, to time in school, and to the summer months, it is certain that the summer period affords opportunities to mitigate them. It is certain too that these opportunities are not being fully PREPUBLICATION COPY, UNCORRECTED PROOFS 3-24

exploited. CONCLUSIONS  CONCLUSION 3-1 Ensuring optimal nutrition, physical activity, and continuation of effective school-year programs for all children and youth in the summer would reduce health risks related to obesity and food insecurity that children and youth experience in the summer months.  CONCLUSION 3-2 More research is needed to understand the full impact of summertime experiences on outcomes and trajectories related to child and youth safety; pro- and anti-social, risk-taking, and delinquency-related behaviors; mental health; and social and emotional development. This need is especially great for underserved populations, which have been underrepresented in the research literature to date, including children who are American Indian, Alaska Native, Native Hawaiian, Pacific Islander, immigrant, migrant and refugee, homeless, child welfare or justice system - involved, and LGBTQ+, as well as those with special health care or developmental needs.  CONCLUSION 3-3 The Summer Food Service Program and the Summer Electronic Benefits Transfer for Children program play crucial roles in reducing food insecurity and increasing access to healthy foods during the summer. REFERENCES Alexander, K. L. and Condliffe, B. F. (2016). School’s out: Summer learning loss across grade levels and school contexts in the United States today. In K. L. Alexander, S. Pitcock, and M. Boulay (Eds.), The Summer Slide: What We Know and Can Do About Summer Learning Loss. New York: Russell Sage Foundation. Alexander, K. L., Entwisle, D. R., and Olson, L. S. (2001). Schools, achievement and inequality: A seasonal perspective. Educational Evaluation and Policy Analysis, 23, 171–191. Alexander, K.L., Entwisle, D.R. and Olson, L.S. (2007). Lasting consequences of the summer learning gap. American Sociological Review, 72(2), pp.167-180. Ali, S., Rosychuk, R. J., Dong, K. A., and McGrath, P. J., and Newton, S. 2012. Temporal trends in pediatric mental health visits: Using longitudinal data to inform emergency department health care planning. Pediatric Emergency Care, 28(7) (July), 620–5. Ambrose, S. A., and Lovett, M. C. (2014). Prior knowledge is more important than content: Skills and beliefs also impact learning. In V. A. Benassi, C. E. Overson, and C. M. Hakala (Eds.), Applying Science of Learning in Education: Infusing Psychological Science into the Curriculum (pp. 7–19). Retrieved from the Society for the Teaching of Psychology web site: http://teachpsych.org/ebooks/asle2014/index.php. An, R., Yang, Y., Hoschke, A., Xue, H., and Wang, Y. 2017. Influence of neighborhood safety on childhood obesity: A systematic review and meta-analysis of longitudinal studies. Obesity Review 18(11)(November), 1289–1309. Ananthakrishnan, V. (2019). Understanding the Characteristics and Needs of At-Risk and Youth Justice System-Involved Youth and the Implications for Summertime Experiences. Paper Commissioned by the Committee on Summertime Experiences, and Child and PREPUBLICATION COPY, UNCORRECTED PROOFS 3-25

Adolescent Education, Health and Safety. Washington, DC: National Academies of Sciences, Engineering, and Medicine. Arnett, J. J. (2018). Getting better all the time: Trends in risk behavior among American adolescents since 1990. Archives of Scientific Psychology, 6(1), 87–95. Astington, J. W. and Edward, M. J. (2010). The development of theory of mind in childhood. In R. E. Tremblay, M. Boivin, R. DeV. Peters, and P. D. Zelazo (Eds.). Encyclopedia on Early Childhood Development [online]. http://www.child-encyclopedia.com/social- cognition/according-experts/development-theory-mind-early-childhood. Atkin, A. J., Sharp, S. J., Harrison, F., Brage, S., Van Sluijs, E. M. (2016). Seasonal variation in children's physical activity and sedentary time. Medicine and Science in Sports and Exercise 48(3)(March), 449–56. Atteberry, A., and McEachin, A. (2016). Summer learning loss across grade levels and school contexts in the United States today. In Alexander, Pitcock, and Boulay, (Eds.), The Summer Slide: What We Know and Can Do About Summer Learning Loss. Atteberry, Allison, and Andrew McEachin. (2019). School's Out: The Role of Summers in Understanding Achievement Disparities. (EdWorkingPaper: 19-82). Retrieved from Annenberg Institute at Brown University: http://www.edworkingpapers.com/ai19-82 Avery, A., Anderson, C., and McCullough, F. (2017). Associations between children's diet quality and watching television during meal or snack consumption: A systematic review. Maternal Child Nutrition 13(e12428), 1–20. Baltes, P.B., Lindenberger, U. and Staudinger, U.M. (2006). Life span theory in developmental psychology. Hoboken. Bartko, W.T. and Eccles, J.S. (2003). Adolescent participation in structured and unstructured activities: A person-oriented analysis. Journal of Youth and Adolescence, 32(4), pp.233- 241. Bassok, D., Latham, S., and Rorem, A. (2016). Is kindergarten the new first grade? AERA open, 1(4), 1-31. Benson, J. and Borman, G. (2010). Family, Neighborhood, and School Settings across Seasons: When Do Socioeconomic Context and Racial Composition Matter for the Reading Achievement Growth of Young Children? Teachers College Record, 112(5), pp.1338- 1390. Blair, C., and Diamond, A. (2008). Biological processes in prevention and intervention: The promotion of self-regulation as a means of preventing school failure. Development and Psychopathology, 20(3), 899–911. Blodgett, C., and Lanigan, J. D. (2018). The association between adverse childhood experience (ACE) and school success in elementary school children. School Psychology Quarterly, 33(1), 137–146. Borman, G.D. and Dowling, N.M. (2006). Longitudinal achievement effects of multiyear summer school: Evidence from the Teach Baltimore randomized field trial. Educational Evaluation and Policy Analysis, 28(1), pp.25-48. Brazendale, K., Beets, M. W., Turner-McGrievy, G. M., Kaczynski, A. T., Pate, R. R., and Weaver, R. G. (2018). Children’s obesogenic behaviors during summer versus school: A within-person comparison. Journal of School Health, 88(12), 886–92. Brazendale, K., Beets, M., Weaver, R. G., Pate, R. R., Turner-McGrievy, G. M., Kaczynski, A. T., Chandler, J. L., Bohnert, A., and von Hippel, P. T. (2017). Understanding differences PREPUBLICATION COPY, UNCORRECTED PROOFS 3-26

between summer vs. school obesogenic behaviors of children: the structured days hypothesis. International Journal of Behavioral Nutrition and Physical Activity, 14(100). Britto, P. R., Lye, S. J., Proulx, K., Yousafzai, A. K., Matthews, S. G., Vaivada, T., Perez- Escamilla, R., Rao, N., Ip, P., Fernald, L.C. and MacMillan, H. (2017). Nurturing care: promoting early childhood development. The Lancet, 389(10064), 91–102. Burkam, D.T., Ready, D.D., Lee, V.E. and LoGerfo, L.F. (2004). Social-class differences in summer learning between kindergarten and first grade: Model specification and estimation. Sociology of Education, 77(1), pp.1-31. Cahalan, M., Perna, L. W., Yamashita, M., Wright, J., and Santillan. (2018). 2018 Indicators of Higher Education Equity in the United States: Historical Trend Report. Washington, DC: The Pell Institute for the Study of Opportunity in Higher Education. Campbell M. J., Holgate, S. T., and Johnston, S. L. (1997). Trends in asthma mortality. BMJ 315(1012). Canner, J. K., Giuliano, K., Selvarajah, S., Hammond, E. R, and Schneider, E. B. (2018). Emergency department visits for attempted suicide and self-harm in the USA: 2006–13. Epidemiology and Psychiatric Sciences 27(1), 94–102. Cantor, P., Osher, D., Berg, J., Steyer, L., and Rose, T. (2018). Malleability, plasticity, and individuality: How children learn and develop in context. Applied Developmental Science 22(2), 1–31. Card, N. A. (2017). Methodological issues in measuring the development of character. Journal of Research in Character Education, 13(2), 29–45. Carrel, A. L., Clark, R. R., Peterson, S., et al. (2007). School-based fitness changes are lost during the summer vacation. Archives of Pediatric Adolescent Medicine, 161(6), 561–64. Carson, V., and Spence, J. C. (2010). Seasonal variation in physical activity among children and adolescents: A Review. Pediatric Exercise Science, 22(1), 81–92. Carter, P. L., Skiba, R., Arredondo, M. I., and Pollock, M. (2017). You can’t fix what you don’t look at: Acknowledging race in addressing racial discipline disparities. Urban Education, 52(2), 207–35. Centers for Disease Control and Prevention (2017). 10 Leading Causes of Injury Deaths by Age Group Highlighting Unintentional Injury Deaths, United States–2017. Available: https://www.cdc.gov/injury/wisqars/pdf/leading_causes_of_injury_deaths_highlighting_u nintentional_2017-508.pdf. Center on the Developing Child. (2016). From best practices to breakthrough impacts: A science-based approach to building a more promising future for young children and families. Cambridge, MA: Harvard University, Center on the Developing Child. Retrieved from https://developingchild.harvard.edu/resources/from-best-practices-to- breakthrough-impacts/ Collins A. M., Briefel, R., Klerman, J. A., Wolf, A., Rowe, G., Logan, C., Enve, A., Fatima, S., Gordon, A., and Lyskawa, J. (2016). Summer Electronic Benefit Transfer for Children (SEBTC) Demonstration: Summary Report. Policy Research Report. Washington, DC: Mathematica Policy Research. Cooper, H., Nye, B., Charlton, K., Lindsay, J., and Greathouse, S. (1996). The effects of summer vacation on achievement test scores: A narrative and meta-analytic review. Review of Educational Research, 66(3), 227–68. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-27

Cross, A. B., Gottfredson, D. C., Wilson, D. M., Rorie, M., and Connell, N. (2009). The impact of after-school programs on the routine activities of middle-school students: Results from a randomized, controlled trial. Criminology & Public Policy, 8(2), 391–412. Cullen, K. A., Ambrose, B. K., Gentzke, A. S., Apelberg, B. J., Jamal, A., and King, B. A. (2018). Notes from the Field: Use of electronic cigarettes and any tobacco product among middle and high school students—United States, 2011–2018. Morbidity and Mortality Weekly Report 67, 1276–1277. Doi: http://dx.doi.org/10.15585/mmwr.mm6745a5external icon. Deans for Impact. (2015). The Science of Learning. Austin, TX. Deluca, S., Rosenblatt, P., and Wood, H. (2011). Why Poor People Move (and Where They Go): Residential Mobility, Selection and Stratification. Paper presented to the American Sociological Association, Las Vegas, NV. Deutsch, N. L. (2017). Construct(ion) and context: A response to methodological issues in studying character. Journal of Character Education, 13(2), 53–63. DiPrete, T. A., and Jennings, J. L. (2012). Social and behavioral skills and the gender gap in early educational achievement. Social Science Research, 41(1), 1–15. Dishion, T. J., and Tipsord, J. M. (2011). Peer contagion in child and adolescent social and emotional development. Annual Review of Psychology, 62, 189–214. Dowd, D., Keenan H. T., and Bratton S. L. (2002). Epidemiology and prevention of childhood injuries. Critical Care Medicine, 30, S385–92. Downey, D. B., and Boughton, H. R. (2007). Childhood body mass index gain during the summer versus during the school year. New Directions for Youth Development, 114, 33– 43. Downey, D.B., Von Hippel, P.T. and Broh, B.A. (2004). Are schools the great equalizer? Cognitive inequality during the summer months and the school year. American Sociological Review, 69(5), pp.613-635. Downey, D. B., Workman, J., and von Hippel, P. (2019). Socioeconomic, ethnic, racial, and gender gaps in children’s social/behavioral skills: Do they grow faster in school or out? Sociological Science, 6, 446–466. Durlak, J. A., Weissberg, R. P., Dymnicki, A. B., Taylor, R. D. and Schellinger, K. B. (2011). The impact of enhancing students’ social and emotional learning: A meta-analysis of school-based universal interventions. Child Development, 82(1), 405–32. Eccles, J. S., Barber, B. L., Stone, M., and Hunt, J. (2003). Extracurricular activities and adolescent development. Journal of Social Issues, 59(4), 865. Eccles, J. S., Midgley, C., Wigfield, A., Buchanan, C. M., Reuman, D., Flanagan, C., and Mac Iver, D. (1993). Development during adolescence: The impact of stage-environment fit on young adolescents' experiences in schools and in families. American Psychologist, 48(2), 90–101. Eccles, J. S., and Roeser, R. W. (2011). Schools as developmental contexts during adolescence. Journal of Research on Adolescence, 21(1), 225–241. Economic Policy Institute (2018). Unemployment Rate of Workers Age 16 and Older by Race and Ethnicity, 1995–2015: Unemployment Rate By Race And Ethnicity. Retrieved from http://stateofworkingamerica.org/charts/unemployment-by-race-and-ethnicity/ (accessed July 31, 2019). Economos, C. D., Hyatt, R. R., Must, A., Goldberg, J. P., Kuder, J., Naumova, E. N., Collins, J. J., and Nelson, M. E. (2013). Shape up Somerville two-year results: A community-based PREPUBLICATION COPY, UNCORRECTED PROOFS 3-28

environmental change intervention sustains weight reduction in children. Preventive Medicine, 57(4), 322–27. Eisenberg, N., and Spinrad, T. L. (2014). Multidimensionality of prosocial behavior. In L. M. Padilla-Walker, G. Carlo (Eds.), Prosocial Development: A Multidimensional Approach (pp. 17–39). New York, NY: Oxford University Press. Elias, M. J., Zins, J. E., Weissberg, R. P., Frey, K. S., Greenberg, M. T., Haynes, N. M., Kessler, R., Schwab-Stone, M.E., and Shriver, T. P. (1997). Promoting Social and Emotional Learning: Guidelines for Educators. Alexandria, VA: Association for Supervision and Curriculum Development. Entwisle, D.R. and Alexander, K.L. (1990). Beginning school math competence: Minority and majority comparisons. Child development, 61(2), pp.454-471. Entwisle, D.R. and Alexander, K.L. (1992). Summer setback: Race, poverty, school composition, and mathematics achievement in the first two years of school. American Sociological Review, pp.72-84. Entwisle, D.R. and Alexander, K.L. (1994). Winter setback: The racial composition of schools and learning to read. American Sociological Review, pp.446-460. Entwisle, D. R., and Alexander, K. L. (1998). Facilitating the transition to first grade: The nature of transition and research on factors affecting it. The Elementary School Journal, 98(4), 351–64. Entwisle, D. R., Alexander, K. L., and Olson, L. S. (1997). Children, schools, and inequality. Boulder, CO: Westview Press. Espinet, S. D., Anderson, J. E., and Zelazo, P. D. (2012). N2 amplitude as a neural marker of executive function in young children: An ERP study of children who switch versus perseverate on the Dimensional Change Card Sort. Developmental Cognitive Neuroscience, 15(2, Suppl. 1), S49–S58. Essex, M. J., Shirtcliff, E. A., Burk, L. R., Ruttle, P. L., Klein, M. H., Slattery, M. J., Kalin, N. H. and Armstrong, J. M. (2011). Influence of early life stress on later hypothalamic– pituitary–adrenal axis functioning and its covariation with mental health symptoms: a study of the allostatic process from childhood into adolescence. Development and psychopathology, 23(4), pp.1039-1058. Evans, G. W. (February/March 2004). The environment of childhood poverty. American Psychologist, 59(2), 77–92. Farrell, A. D., Goncy, E. A., Sullivan, T. N., and Thompson, E. L. (2017). Victimization, aggression, and other problem behaviors: Trajectories of change within and across middle school grades. Journal of Research on Adolescence, 28(2), 438–55. Farrell, A. D., Henry, D. B., Mays, S. A., and Schoeny, M. E. (2011). Parents as moderators of the impact of school norms and peer influences on aggression in middle school students. Child Development, 82, 146–161. Farrell, A. D., Sullivan, T. N., Esposito, L. E., Meyer, A. L. and Valois, R. F. (2005). A latent growth curve analysis of the structure of aggression, drug use, and delinquent behaviors and their interrelations over time in urban and rural adolescents. Journal of Research on Adolescence, 15(2), 179–204. Farnsworth, C. L., Silva, P. D, and Mubarak, S. J. (1998). Etiology of supracondylar humerus fractures. Journal of Pediatric Orthopedics, 18(1), 38–42. Felitti, V. J., Anda, R. F., Nordenberg, D., Williamson, D. F., Spitz, A. M., Edwards, V., Koss, M. P. and Marks, J. S. (2019). Relationship of childhood abuse and household PREPUBLICATION COPY, UNCORRECTED PROOFS 3-29

dysfunction to many of the leading causes of death in adults: The Adverse Childhood Experiences (ACE) Study. American Journal of Preventive Medicine, 56(6), 774–786. Fischer, K. W., and Bidell, T. R. (2006). Dynamic development of action and thought. In R. M. Lerner (Ed.), Handbook of Child Psychology—Vol. 1: Theoretical Models of Human Development (6th ed., pp. 313–399). New York: Wiley. Fitzpatrick, M.D., Grissmer, D. and Hastedt, S. (2011). What a difference a day makes: Estimating daily learning gains during kindergarten and first grade using a natural experiment. Economics of Education Review, 30(2), pp.269-279. Food Research and Action Council. (2018). Hunger Doesn’t Take a Vacation: Summer Nutrition Status Report. Washington, DC: Food Research and Action Center. Fredricks, J. A., and Eccles, J. S. (2006). Extracurricular involvement and adolescent adjustment: Impact of duration, number of activities, and breadth of participation. Applied Developmental Science, 10(3), 132–146. Geisz, M. B., and Nakashian, M. (2016). Adolescent Wellness: Current Perspectives and Future Opportunities in Research, Policy, and Practice. Unpublished report, Robert Wood Johnson Foundation. Geller, A. (2019). Summertime Exposure to Police Among School-Aged Youth. Paper commissioned by the Committee on Summertime Experiences, and Child and Adolescent Education, Health and Safety. Washington, DC: National Academies of Sciences, Engineering, and Medicine. Gestsdottir, G., and Lerner, R. M. (2008). Positive development in adolescence: The development and role of intentional self-regulation. Human Development, 51, 202–24. Gilchrist, J. and Parker, E. M. (2014). Racial/ethnic disparities in fatal unintentional drowning among persons aged ≤ 29 years—United States, 1999–2010. Morbidity and Mortality Weekly Report, 63(19), 421. Gilliam, W. S., Maupin, A. N., Reyes, C. R., Accavitti, M., and Shic, F. (2016). Do Early Educators’ Implicit Biases Regarding Sex and Race Relate to Behavior Expectations and Recommendations of Preschool Expulsions and Suspensions. Research Study Brief, Yale University, Yale Child Study Center, New Haven, CT. Ginsburg, K. R. (2007). The importance of play in promoting healthy child development and maintaining strong parent-child bonds. Pediatrics, 119(1), 182–191. Gordon, A. R., Briefel, R. R., Collins, A. M., Rowe, G. M., and Kleman, J. A. (2017). Delivering summer electronic benefit transfers for children through the Supplemental Nutrition Assistance Program or the Special Supplemental Nutrition Program for Women, Infants, and Children: Benefit use and impacts on food security and foods consumed. Journal of the Academy of Nutrition and Dietetics, 117(3), 368. Greenberg, M., and Weissberg, R. (2018). Social and Emotional Development Matters: Taking Action Now for Future Generations. Edna Bennett Pierce Prevention Research Center, Pennsylvania State University. Gregory, A., Skiba, R. J., and Mediratta, K. (2017). Eliminating disparities in school discipline: A framework for intervention. Review of Research in Education, 41(1), 253–78. Gutin, B., Yin, Z., Johnson, M., Barbeau, P. (2008). Preliminary findings of the effect of a 3-year after-school physical activity intervention on fitness and body fat: The Medical College of Georgia Fitkid Project. International Journal of Pediatric Obesity 3(Suppl. 1), 3–9. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-30

Halle, T., Forry, N., Hair, E., Perper, K., Wandner, L., Wessel, J., and Vick, J. (2009). Disparities in early learning and development: Lessons from the Early Childhood Longitudinal Study–Birth Cohort (ECLS-B). Child Trends, 1–7. Harper, R., Hermann, H., and Waite, W. (2018a). Science of Adolescent Learning: How Body and Brain Development Affect Student Learning. Washington, D.C.: Alliance for Excellent Education. ________. (2018b). Science of Adolescent Learning: Risk Taking, Rewards, and Relationships. Washington, D.C.: Alliance for Excellent Education. ________. (2018c). Science of Adolescent Learning: Valuing Culture, Experiences, and Environments. Washington, D.C.: Alliance for Excellent Education. Harrell, E., Langton, L., Berzofsky, M., Couzens, L. and Smiley-McDonald, H., 2014. Household Poverty and Nonfatal Violent Victimization, 2008-2012. Washington, DC: US Department of Justice, Office of Justice Programs, Bureau of Justice Statistics. Hayes, M.S. and Gershenson, S. (2016). What differences a day can make: Quantile regression estimates of the distribution of daily learning gains. Economics Letters, 141, pp.48-51. Heron, M. (2019). Deaths: Leading causes for 2017. National Vital Statistics Reports, 68, 6. Retrieved from https://www.cdc.gov/nchs/data/nvsr/nvsr68/nvsr68_06-508.pdf Heyns, B. (1978). Summer Learning and the Effects of Schooling. New York: Academic. Hofferth, S. L. and Sandberg, J. F. (2001). How American children spend their time. Journal of Marriage and Family, 63(2), pp.295-308. Holder, S. M., Rogers, K., Peterson, E., and Ochonma, C. (2017). Mental health visits: Examining socio-demographic and diagnosis trends in the emergency department by the pediatric population. Child Psychiatry and Human Development, 48(6), 993–1000. Hopkin, L. C., Hooker, N. H., and Gunther, C. (2017). Securing a stop to the summer setback: Policy considerations in the future expansion of the summer electronic benefit transfer for children. Journal of Nutrition Education and Behavior, 49, 692–99. Howland, J., Hingson, R., Mangione, T.W., Bell, N., and Bak, S. (1996). Why are most drowning victims men? Sex differences in aquatic skills and behaviors. American Journal of Public Health, 86(1), 93–96. Hoynes, H., Schanzenbach, D. W., and Almond, D. (2016). Long-run impacts of childhood access to the safety net. American Economic Review, 106(4), 903–34. Huang, L. X., Schildhaus, S. and Wright, D. (1999). Seasonality of Substance Abuse: National Household Survey on Drug Abuse 1992-96. Office of Applied Studies, Substance Abuse and Mental Health Services Administration. Institute of Medicine. (2000). From Neurons to Neighborhoods: The Science of Early Childhood Development. Washington, DC: The National Academies Press. Institute of Medicine and National Research Council. (2015). Transforming the Workforce for Children Birth Through Age 8: A Unifying Foundation. Washington, DC: National Academies Press. Irwin, C. C., Irwin, R. L., Ryan, T. D. and Drayer, J. (2009). Urban minority youth swimming (in)ability in the United States and associated demographic characteristics: Toward a drowning prevention plan. Injury Prevention, 15(4), 234–239. Jacob, B. A., and Lefgren, L. (2003). Are idle hands the devil's workshop? Incapacitation, concentration, and juvenile crime. American Economic Review, 93(5), 1560–77. Jagers, R. J., Rivas-Drake, N., and Borowski, T. (2018). Equity and social-emotional learning: A cultural analysis. In Measuring SEL: Using Data to Inform Practice. Frameworks brief, PREPUBLICATION COPY, UNCORRECTED PROOFS 3-31

Social Emotional Competence Assessments Working Group. Retrieved from https://measuringsel.casel.org/wp-content/uploads/2018/11/Frameworks-Equity.pdf Jespersen, E., Holst, R., Franz, C. Rexen, C. T., and Wedderkopp, N. (2014). Seasonal variation in musculoskeletal extremity injuries in school children aged 6–12 followed prospectively over 2.5 years: A cohort study. BMJ, 4(1). Jessor, R. and Jessor, S. L. (1977). Problem behavior and psychosocial development: A longitudinal study of youth. New York: Academic Press. Johnson N. K., Johnson, B. M., Denning, G. M., and Jennissen, C. A. (2017). Pediatric moped- related injuries in the United States from 2002 to 2014: Age-related comparisons of mechanisms and outcomes. Journal of Trauma Acute Care Surgery, 83(5S Suppl 2): S201-S209. Johnson, S. B., Riis, J. L., and Noble, K. G. (2016). State of the art review: Poverty and the developing brain. Pediatrics, 137(4), 1–16. Retrieved from http://pediatrics.aappublications.org/content/early/2016/03/03/peds.2015-3075 Johnston, N. W., and Sears, M. R. (2006). Asthma exacerbations 1: Epidemiology. Thorax 61, 722–28. doi: 10.1136/thx.2005.045161 Jones, S. (2016). The Taxonomy Project—Proposal to Bring the Field Along. Cambridge, MA: Harvard Graduate School of Education. Jones, S. M., Zaslow, M., Darling-Churchill, K.E. and Halle, T. G. (2016). Assessing early childhood social and emotional development: Key conceptual and measurement issues. Journal of Applied Developmental Psychology, 45, 42–48. Keenan, H. T., and Bratton, S. L. (2002). Epidemiology and prevention of childhood injuries. Critical Care Medicine 30, S385–92. Kochanek, K. D., Murphy, S. L., Xu, J., and Arias, E. (2019). Deaths: Final Data for 2017. National Vital Statistics Reports, 68, 9. Retrieved from https://www.cdc.gov/nchs/data/nvsr/nvsr68/nvsr68_09-508.pdf Kornides, M. L., Gillman, M. W., Rosner, B., Rimm, E. B., Chavarro, J. E., and Field, A. E. (2018). U.S. adolescents at risk for not meeting physical activity recommendations by season. Pediatric Research 84(1), 50–56. Kuhfield, M. (2018a). Summer Learning Loss: What We Know and What We’re Learning. Retrieved from https://www.nwea.org/blog/2018/summer-learning-loss-what-we-know- what-were-learning/. ________. (2018b). Summer Learning Loss: Does It Widen the Achievement Gap? Retrieved from https://www.nwea.org/blog/2018/summer-learning-loss-does-it-widen-the- achievement-gap/. ________. (2019). Rethinking Summer Slide: The More You Gain, the More You Lose. Retrieved from https://www.kappanonline.org/rethinking-summer-slide-the-more-you-gain-the- more-you-lose/. Kurtz-Costes, B., and Rowley, S. J. (2012). School transitions and African American youth. In S. A. Karabenick and T. C. Urdan (Eds.), Transitions Across Schools and Cultures: Advances in Motivation and Achievement, 17, 27–54. Bingley, UK: Emerald Group Publishing Limited. Lauritsen, J. L. and White, N. (2014). Seasonal Patterns in Criminal Victimization Trends. Washington, DC: U.S. Department of Justice, Office of Justice Programs, Bureau of Justice Statistics. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-32

Lee, V., and Burkam, D. T. (2002). Inequality at the Starting Gate: Social Background Differences in Achievement as Children Begin School. Washington, D.C.: Economic Policy Institute. Legewie, J., and Fagan, J. (2019). Aggressive policing and the educational performance of minority youth. American Sociological Review, 84(2), 220–247. Lerner, R. M. (2002). Concepts and Theories of Human Development. Mahwah, NJ: Lawrence Erlbaum Associates. Lerner, R. M., Lerner, J. V., Almerigi, J. B., Theokas, C., Phelps, E., Gestsdottir, S., Naudeau, S., Jelicic, H., Alberts, A., Ma, L., and Smith, L. M. (2005). Positive youth development, participation in community youth development programs, and community contributions of fifth-grade adolescents: Findings from the first wave of the 4-H study of positive youth development. Journal of Early Adolescence, 25(1), 17–71. Light, J. M., Rusby, J. C., Nies, K. M., and Snijders, T. A. (2013). Antisocial behavior trajectories and social victimization within and between school years in early adolescence. Journal of Research on Adolescence, 24(2), 322–36. Loder, R. T., and Abrams, S. (2011). Temporal variation in childhood injury from common recreational activities. Injury, 42(9), 945–57. Loder, R. T., Krodel, E., and D’Amico, K. (2012). Temporal variation in pediatric supracondylar humerus fractures requiring surgical intervention. Journal of Children’s Orthopaedics, 6(5), 419–25. Loeber, R., and Burke, J. D. (2011). Developmental pathways in juvenile externalizing and internalizing problems. Journal of Research on Adolescence, 21(1), 34–46. Luengo Kanacri, B. P., Pastorelli, C., Eisenberg, N., Zuffianò, A. and Caprara, G. V. (2013). The development of prosociality from adolescence to early adulthood: The role of effortful control. Journal of Personality, 81(3), 302–312. Mahoney, J. L. (2000). School extracurricular activity participation as a moderator in the development of antisocial patterns. Child Development, 71, 502–16. ________. (2010). Adolescent summer care arrangements and risk for obesity the following school year. Journal of Adolescence, 34(4), 737–49. Mahoney, J. L., and Cairns, R. B. (1997). Do extracurricular activities protect against early school dropout? Developmental Psychology, 33(2), 241. Mahoney, J. L., and Stattin, H. (2000). Leisure activities and adolescent antisocial behavior: The role of structure and social context. Journal of Adolescence, 23, 113–27. Malin, A. J., Busgang, S. A., Cantoral, A. J., Svensson, K., Orjuela, M. A., Pantic, I., Schnaas, L., Oken, E., Baccarelli, A. A., Téllez-Rojo, M. M., Wright, R. O., and Gennings, C. (2018). Quality of prenatal and childhood diet predicts neurodevelopmental outcomes among children in Mexico City. Nutrients, 10(8). doi: 10.3390/nu10081093 Martin, D., Martin, M., Gibson, S. S., and Wilkins, J. (2007). Increasing prosocial behavior and academic achievement among adolescent African American males. Adolescence, 42(168), 689–98. Maslow, A. H. (1943). A theory of human motivation. Psychological Review, 50(4), 370–96. McClendon, M. E., Umstattd, Meyer, M. R., Ylitalo, K. R., and Sharkey, J. R. (2017). Physical activity of Mexican-heritage youth during the summer and school-year: The role of parenting strategies. Journal of Community Health, 42(6), 1102–10. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-33

McCoach, D.B., O'Connell, A.A., Reis, S.M. and Levitt, H.A. (2006). Growing readers: A hierarchical linear model of children's reading growth during the first 2 years of school. Journal of educational psychology, 98(1), p.14. McKown, C. (2017a). Promises and perils of assessing character and social and emotional learning. Journal of Character Education, 13(2), 47–52. ________. (2017b). Social and emotional learning: A policy vision for the future. The Future of Children, 27(1), 157–78. Meade, E. E. (2014). Overview of Community Characteristics in Areas With Concentrated Poverty. Washington, DC: ASPE Research Brief. Office of the Assistant Secretary for Planning and Evaluation, U.S. Department of Health and Human Services. Retrieved from https://aspe.hhs.gov/system/files/pdf/40651/rb_concentratedpoverty.pdf. Miles, R., Wang, Y., and Johnson, S. B. (2018). Neighborhood built and social environments and change in weight status over the summer in low-income elementary school children. International Journal of Environmental Research and Public Health, 15(6). Miller, D. P. (2016). Accessibility of summer meals and the food insecurity of low-income households with children. Public Health Nutrition, 19(11), 2079–2089. Milteer, R. M., Ginsburg, K. R., and Mulligan, D. A. (2012). The importance of play in promoting healthy child development and maintaining strong parent-child bond: Focus on children in poverty. Pediatrics, 129(1), e204 - e213. Moffitt, T. E. (1993). Adolescence-limited and life-course-persistent antisocial behavior: A developmental taxonomy. Psychological Review, 100(4), 674–701. Moreno, J. P., Johnston, C. A., and Woehler, D. (2013). Changes in weight over the school year and summer vacation: Results of a 5-year longitudinal study. Journal of School Health, 83(7), 473–77. Nagaoka, J., Farrington, C. A., Ehrlich, S. B. and Heath, R.D. (2015). Foundations for Young Adult Success: A Developmental Framework. Concept Paper for Research and Practice, University of Chicago Consortium on Chicago School Research. Nagin, D., and Tremblay, R. E. (1999). Trajectories of boys’ physical aggression, opposition, and hyperactivity on the path to physically violent and nonviolent juvenile delinquency. Child Development, 70(5), 1181–1196. National Academies of Sciences, Engineering, and Medicine. (2019a). The Promise of Adolescence: Realizing Opportunity for All Youth. Washington, DC: National Academies Press. ________. (2019b). Vibrant and Healthy Kids: Aligning Science, Practice, and Policy to Advance Health Equity. Washington, DC: National Academies Press. ________. (2019c). A Roadmap to Reducing Child Poverty. Washington, DC: National Academies Press. https://doi.org/10.17226/25246. National Commission on Social, Emotional, and Academic Development. (2019). From a Nation at Risk to a Nation at Hope. Aspen, CO: The Aspen Institute. National Research Council. (2013). Education for Life and Work: Developing Transferable Knowledge and Skills in the 21st Century. Washington, DC: National Academies Press. National Research Council and Institute of Medicine. (2002). Community Programs to Promote Youth Development. Washington, DC: National Academies Press. Nelson, E. E., Leibenluft, E., McClure, E. B., and Pine, D. S. (2005). The social re-orientation of adolescence: A neuroscience perspective on the process and its relation to psychopathology. Psychological Medicine, 35(2), 163–74. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-34

Office of Juvenile Justice and Delinquency Prevention. (2019). Performance Measures: Glossary. Washington, DC: U.S. Department of Justice. Retrieved from https://www.ojjdp.gov/grantees/pm/glossary.html#D Okonofua, J. A., and Eberhardt, J. L. (2015). Two strikes: Race and the disciplining of young students. Psychological Science, 26, 617–24. Okonofua, J. A., Walton, G. M., and Eberhardt, J. A. (2016). A vicious cycle: A social- psychological account of extreme racial disparities in school discipline. Perspectives on Psychological Science, 11, 381–98. Osher, D., Cantor, P., Berg, J., Steyer, L. and Rose, T., 2018. Drivers of human development: How relationships and context shape learning and development. Applied Developmental Science, 1–31, doi: 10.1080/10888691.2017.1398650. Osofsky, J. D. 1999. The impact of violence on children. The Future of Children, 9(3), 33–49. Parks, R. M., Bennett, J. E., Foreman, K. J., Toumi, R., and Ezzati, M. (2018). National and regional seasonal dynamics of all-cause and cause-specific mortality in the USA from 1980 to 2016. eLife 7(e35500). Patterson, G. R., & Yoerger, K. (2002). A developmental model for early- and late-onset delinquency. In J. B. Reid, G. R. Patterson, and J. Snyder (Eds.), Antisocial Behavior in Children and Adolescents: A Developmental Analysis and Model for Intervention (pp. 147–172). Washington, DC: American Psychological Association. Persson, A., Kerr, M., and Stattin, H. (2007). Staying in or moving away from structured activities: Explanations involving parents and peers. Developmental Psychology, 43, 197–207. Phillips, M. (2011). Parenting, time use, and disparities in academic outcomes. In G. J. Duncan and R. J. Murnane (Eds.), Whither Opportunity? Rising Inequality, Schools, and Children's Life Chances (pp. 207–28). New York, NY: Russell Sage. Pitcock, S. (2018). The case for summer learning: Why supporting students and families all year is vitally important. American Educator, 42(1), 4–8, 39. Plemmons, G., Hall, M., Doupnik, S. Gay, J., Brown, C., Browning, W., Casey, R., Freundlich, K., P. Johnson, D. P., Lind, C., Rehm, K., Thomas, S., and Williams, D. (2018). Hospitalization for suicide ideation or attempt: 2008–2015. Pediatrics 141(6), 2017– 2426. Portilla, X. A., Ballard, P. J., Adler, N. E., Boyce, W. T. and Obradović, J. (2014). An integrative view of school functioning: Transactions between self regulation, school engagement, and teacher–child relationship quality. Child Development, 85(5), 1915–1931. Quinn, D. M., Cooc, N., McIntyre, J., and Gomez, C. J. (2016). Seasonal dynamics of academic achievement inequality by socioeconomic status and race/ethnicity: Updating and extending past research with new national data. Educational Researcher, 45(8), 443–53. Quinn, D. M., and Polikoff, M. (2017). Summer Learning Loss: What Is It, and What Can We Do About It? Washington, DC: Brookings. Retrieved from https://www.brookings.edu/research/summer-learning-loss-what-is-it-and-what-can-we- do-about-it/. Ready, D.D. (2010). Socioeconomic disadvantage, school attendance, and early cognitive development: The differential effects of school exposure. Sociology of Education, 83(4), pp.271-286. Reardon, S. (2013). The widening income achievement gap. Educational Leadership, 70(8), 10– 16. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-35

Resiner, E. R., Vandell, D. L., Pechman, E. M., Pierce, K. M., Brown, B. B., Bolt, D. (2007). Charting the Benefits of High-Quality After-School Program Experiences: Evidence From New Research on Improving After-School Opportunities for Disadvantaged Youth. Washington, D.C.: Policy Studies Associates. Rogoff, B. (2003). The Cultural Nature of Human Development. New York, NY: Oxford University Press. Ross, S., and Peselow, E. (2009). The neurobiology of addictive disorders. Clinical Neuropharmacology, 32(5), 269–76. Ryan, A. M., Shim, S. S. and Makara, K. A. (2013). Changes in academic adjustment and relational self-worth across the transition to middle school. Journal of Youth and Adolescence, 42, 1372–84. Sampson, R. J., and Laub, J. H. (2003). Life course desisters? Trajectories of crime among delinquent boys followed to age 70. Criminology, 41(3), 555–92. Scales, P. C., Benson, P. L., and Roehlkepartain, E. C. (2011). Adolescent thriving: The role of sparks, relationships, and empowerment. Journal of Youth and Adolescence, 40(3), 263– 77. Shim, S. S., Ryan, A. M. and Anderson, C.J. (2008). Achievement goals and achievement during early adolescence: Examining time-varying predictor and outcome variables in growth- curve analysis. Journal of Educational Psychology, 100(3), 655. Siegel, D. J. (2013). Brainstorm: The Power and Purpose of the Teenage Brain. New York, NY: Penguin Putnam. Sisk, C. L., and Zehr, J. L. (2005). Pubertal hormones organize the adolescent brain and behavior. Frontiers in Neuroendocrinology, 26(3–4), 163–74. Smith, D. T., Bartee, R. T., Dorozynski, C. M., and Carr, L. J. (2009). Prevalence of overweight and influence of out-of-school seasonal periods on body mass index among American Indian schoolchildren. Preventing Chronic Disease, 6(1), A20. Stalsberg, R., and Pedersen, A. V. (2010). Effects of socioeconomic status on the physical activity in adolescents: A systematic review of the evidence. Scandinavian Journal of Medicine and Science in Sports 20, 368–83. Stanford Center for Educational Policy Analysis. (ND). Racial and Ethnic Achievement Gaps. Palo Alto, CA: Stanford University. Retrieved from https://cepa.stanford.edu/educational-opportunity-monitoring-project/achievement- gaps/race/ Steinberg, L. (2014). Age of Opportunity: Lessons From the New Science of Adolescence. Boston, MA: Houghton Mifflin Harcourt. Substance Abuse and Mental Health Services Administration, Center for Behavioral Health Statistics and Quality. (July 2, 2012). The NSDUH Report: Monthly Variation in Substance Use Initiation among Adolescents. Rockville, MD. Available at: https://www.samhsa.gov/data/sites/default/files/NSDUH080/NSDUH080/SR080Initiatio nSubstanceUse2012.htm Tarullo, A.R., Obradovic, J. and Gunnar, M.R. (2009). Self-control and the developing brain. Zero to three, 29(3), p.31. Taylor, J. J., Buckley, K., Hamilton, L. S., Stecher, B. M., Read, L., and Schweig, J. (2018). Choosing and Using SEL Competency Assessments: What Schools and Districts Need toKnow. Rand Corporation. Retrieved from http://measuringsel.casel.org/pdf/Choosing- PREPUBLICATION COPY, UNCORRECTED PROOFS 3-36

and-Using-SEL-Competency-Assessments_What-Schools-and-Districts-Need-to- Know.pdf Teicher, M. H., Samson, J. A., Anderson, C. M. and Ohashi, K. (2016). The effects of childhood maltreatment on brain structure, function and connectivity. Nature Reviews Neuroscience, 17(10), 652. Turi, K., Gebretsadik, T., Lee, R., Hartert, T., Evans, A., Stone, C., Sicignano, N., Wu, A., Iribarren, C., Butler, M., Mitchel, E., Morrow, E., Larkin, E., and Wu, P. (2018). Seasonal patterns of Asthma medication fills among diverse populations of the United States. Journal of Asthma, 55(7), 764–70. U.S. Department of Agriculture. (1998). Food That’s In When School Is Out: Summer Food Service Program for Children: Rural Programs. Washington, DC: U.S. Department of Agriculture, Food and Nutrition Service. ________. (2008). The Pennsylvania SFSP Rural Area Eligibility Pilot Evaluation Final Report. Washington, DC. ________. (2013). Summer Electronic Benefits Transfer for Children (SEBTC) Demonstration: Evaluation Findings for the Full Implementation Year 2012 Final Report. Washington, DC. U.S. Department of Housing and Urban Development, Office of Policy Research and Development. (2016). Evidence Matters: Neighborhoods and Violent Crime. Retrieved from https://www.huduser.gov/portal/periodicals/em/summer16/highlight2.html. Vilorio, D. (2016). Education Matters: Career Outlook. Washington, DC: U.S. Bureau of Labor Statistics. Retrieved from https://literacyfacts.wordpress.com/2017/06/29/education- matters-career-outlook/. von Hippel, P. T., and Hamrock, C. (2019). Do test score gaps grow before, during, or between the school years? Measurement artifacts and what we can know in spite of them. Sociological Science, 6, 43–80. von Hippel, P. T., Powell, B., Downey, D. B., and Rowland, N. J. (2007). The effect of school on overweight in childhood: Gain in body mass index during the school year and during summer vacation. American Journal of Public Health, 97, 696–702. von Hippel, P. T., and Workman, J. (2016). From kindergarten through second grade, U.S. children’s obesity prevalence grows only during summer vacations. Obesity, 24(11), 2296–300. von Hippel, P. T., Workman, J., and Downey, D. B. (2018). Inequality in reading and math skills forms mainly before kindergarten: A replication, and partial correction, of ‘Are schools the great equalizer?’ Sociology of Education, 91(4), 323–57. Vygotsky, L. S. (1978). Mind in Society: The Development of Higher Psychological Processes. Cambridge, MA: Harvard University Press. Wang, Y., Cai, L., Wu, Y., Wilson, R. F., Weston, C., Fawole, O., Bleich, S. N., Cheskin, L. J., Showell, N. N., Lau, B. D. and Chiu, D. T. (2015). What childhood obesity prevention programmes work? A systematic review and meta-analysis. Obesity Reviews, 16(7), 547– 65. Wang Y. C., Vine, S., Hsiao, A., Rundle, A., and Goldsmith, J. (2015). Weight-related behaviors when children are in school versus on summer breaks: Does income matter? Journal of School Health, 85(7), 458–66. Washburn, I. J., Acock, A., Vuchinich, S., Snyder, F., Li, K. K., Ji, P., Day, J., DuBois, D. and Flay, B. R. (2011). Effects of a social-emotional and character development program on PREPUBLICATION COPY, UNCORRECTED PROOFS 3-37

the trajectory of behaviors associated with social-emotional and character development: Findings from three randomized trials. Prevention Science, 12(3), 314. Watts, R. J., Diemer, M. A., and Voight, A. M. (2011). Critical consciousness: Current status and future directions. New Directions for Child and Adolescent Development, 134, 43–57. Watts, R. J., and Guessous, O. (2006). Sociopolitical development: The missing link in research and policy on adolescents. In P. Noguera, J. Cammarota, and S. Ginwright (Eds). Beyond Resistance: Youth Activism and Community Change (pp. 59–80). New York, NY: Routledge. Wauchope, B., and Stracuzzi, N. (2010). Challenges in Serving Rural American Children Through the Summer Food Service Program. Durham, NC: Carsey Institute. Weiss, K. B. (1990). Seasonal trends in US hospitalizations and mortality. JAMA, 263, 2323–28. Weissberg, R. P., Durlak, J. A., Domitrovich, C. E., and Gullotta, T. P. (2015). Social and emotional learning: Past, present, and future. In J. A. Durlak, C. E. Domitrovich, R. P. Weissberg, and T. P. Gullotta (Eds.), Handbook for Social and Emotional Learning: Research and Practice (pp. 3–19). New York, NY: Guilford. Wellman, H. M. (2014). Making Minds: How Theory of Mind Develops. Oxford Series in Cognitive Development. New York, NY: Oxford University Press. White, T.G., Kim, J.S., Kingston, H.C. and Foster, L. (2013). Replicating the effects of a teacher scaffolded voluntary summer reading program: The role of poverty. Reading Research Quarterly, 49(1), pp.5-30. Wigfield, A., Eccles, J. S., Mac Iver, D., Reuman, D. A., and Midgley, C. (1991). Transitions during early adolescence: Changes in children’s domain-specific self-perceptions and general self-esteem across the transition to junior high school. Developmental Psychology, 27(4), 552–65. Wisniewski, J. A., McLauglin, A. P., Stenger, P. J,, Patrie, J., Brown, M. A., El-Dahr, J. M., Platts-Mills, T. A. E., Byrd, N. J., and Hyemann, P. W. (2016). A comparison of seasonal trends in asthma exacerbations among children from geographic regions with different climates. Allergy and Asthma Proceedings 37, 475–81. Wu, Y. P., Prout, K., Roberts, M. C., Parikshak, S., and Amylon, M., D. (2011). Assessing experiences of children who attended a camp for children with cancer and their siblings: A preliminary study. Child & Youth Care Forum, 40(2), 121–33. Warren, M. T., Wray-Lake, L., Rote, W. M. and Shubert, J., 2016. Thriving while engaging in risk? Examining trajectories of adaptive functioning, delinquency, and substance use in a nationally representative sample of US adolescents. Developmental Psychology, 52(2), 296. Workman, J. and Merry, J. (2019). Pervasiveness and Magnitude of Summer Learning Loss. Available at SSRN 3325590. Yin, Z., Moore, J. B., Johnson, M. H., Vernon, M. M., and Gutin, B. (2012). The impact of a 3- year afterschool obesity prevention program in elementary school children. Child Obesity, 8, 60–70. Yogman, M., Garner, A., Hutchinson, J., Hirsh-Pasek, K., Golinkoff, R.M. and Committee on Psychosocial Aspects of Child and Family Health. (2018). The power of play: A pediatric role in enhancing development in young children. Pediatrics, 142(3), p.e20182058. Zhang, J., Himes, J. H., Hannan, P. J., Arcan, C., Smyth, M., Rock, B. H., and Story, M. (2011). Summer effects on body mass index (BMI) gain and growth patterns of American Indian PREPUBLICATION COPY, UNCORRECTED PROOFS 3-38

children from kindergarten to first grade: A prospective study. BMC Public Health, 11, 951. Zinkel, S. R., Moe, M., Stern, E. A., Hubbard, V. S., Yanovski, S. Z., Yanovski, J. A., and Schoeler D. A. (2013). Comparison of total energy expenditure between school and summer months. Pediatric Obesity, 8, 404–10. Zvoch, K. and Stevens, J.J. (2013). Summer school effects in a randomized field trial. Early Childhood Research Quarterly, 28(1), pp.24-32. PREPUBLICATION COPY, UNCORRECTED PROOFS 3-39

Next: 4 How Do Summer Programs Influence Outcomes for Children and Youth? »
Shaping Summertime Experiences: Opportunities to Promote Healthy Development and Well-Being for Children and Youth Get This Book
×
Buy Prepub | $69.00 Buy Paperback | $60.00
MyNAP members save 10% online.
Login or Register to save!
Download Free PDF

For children and youth, summertime presents a unique break from the traditional structure, resources, and support systems that exist during the school year. For some students, this time involves opportunities to engage in fun and enriching activities and programs, while others face additional challenges as they lose a variety of supports, including healthy meals, medical care, supervision, and structured programs that enhance development. Children that are limited by their social, economic, or physical environments during the summer months are at higher risk for worse academic, health, social and emotional, and safety outcomes. In contrast, structured summertime activities and programs support basic developmental needs and positive outcomes for children and youth who can access and afford these programs. These discrepancies in summertime experiences exacerbate pre-existing academic inequities. While further research is needed regarding the impact of summertime on developmental domains outside of the academic setting, extensive literature exists regarding the impact of summertime on academic development trajectories. However, this knowledge is not sufficiently applied to policy and practice, and it is important to address these inequalities.

Shaping Summertime Experiences examines the impact of summertime experiences on the developmental trajectories of school-age children and youth across four areas of well-being, including academic learning, social and emotional development, physical and mental health, and health-promoting and safety behaviors. It also reviews the state of science and available literature regarding the impact of summertime experiences. In addition, this report provides recommendations to improve the experiences of children over the summertime regarding planning, access and equity, and opportunities for further research and data collection.

  1. ×

    Welcome to OpenBook!

    You're looking at OpenBook, NAP.edu's online reading room since 1999. Based on feedback from you, our users, we've made some improvements that make it easier than ever to read thousands of publications on our website.

    Do you want to take a quick tour of the OpenBook's features?

    No Thanks Take a Tour »
  2. ×

    Show this book's table of contents, where you can jump to any chapter by name.

    « Back Next »
  3. ×

    ...or use these buttons to go back to the previous chapter or skip to the next one.

    « Back Next »
  4. ×

    Jump up to the previous page or down to the next one. Also, you can type in a page number and press Enter to go directly to that page in the book.

    « Back Next »
  5. ×

    To search the entire text of this book, type in your search term here and press Enter.

    « Back Next »
  6. ×

    Share a link to this book page on your preferred social network or via email.

    « Back Next »
  7. ×

    View our suggested citation for this chapter.

    « Back Next »
  8. ×

    Ready to take your reading offline? Click here to buy this book in print or download it as a free PDF, if available.

    « Back Next »
Stay Connected!