5, and grade 8. The module is also in the new ECLS-K beginning with the kindergarten class of 2010–2011. The Early Childhood Longitudinal Study
-Birth Cohort included the standard 18-item questionnaire with 12-month reference in the panel beginning in 2002. The food security questions were included in surveys in 2002, 2004, 2006–2007, and 2007– 2008. The National Health Interview Survey has included the standard adult 10-item questionnaire with a 30-day reference annually beginning in 2011. The Panel Study of Income Dynamics (PSID) included the standard 18 items with 12-month reference in its child development supplement in 1997, and in the core PSID in 1999, 2001, 2003, 2005, and 2007.
As examples of other uses in large studies, the standard 18-item module was included in multiple waves of the Fragile Families Study and Children’s HealthWatch (previously Children’s Sentinel Nutritional Assessment Program) beginning in 1998. Although neither of these studies is fully nationally representative, they represent large vulnerable populations.