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. "2 Descriptive Epidemiology and Trends." Weight Gain During Pregnancy: Reexamining the Guidelines. Washington, DC: The National Academies Press, 2009.
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FIGURE 2-25 Preterm birth rates for all births and for singletons only: United States, 1990, 2000, and 2005.
SOURCE: NCHS, 2007a.
FIGURE 2-26 Trends in preterm live births in the United States by race, 1990 to 2005.
NOTE: Preterm is defined as an infant born before 37 weeks of gestation.