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Table 2 Age and race/ethnicity of women giving birth in the NCS by eligibility status at the time of consent

From: Impact of preconception enrollment on birth enrollment and timing of exposure assessment in the initial vanguard cohort of the U.S. National Children’s Study

   Status at consent   
   High non-tryer High tryer Pregnant
   % % %
Age, years <18 0 0 1.4
  18–19 * 0 3.3
  20–34 90.9 83.7 76.5
  35+ * 16.3 18.7
  Mean (standard deviation) 27.7 (4.0) 30.7 (4.1) 29.2 (5.7)
Race/ethnicity Asian, non-Hispanic * * 4.2
  Black, non-Hispanic * * 6.4
  Hispanic 22.7 10.2 20.0
  Other^ 20.5 20.4 8.0
  White, non-Hispanic 50.0 67.3 61.5
  1. *Cell counts are too small to display. (Despite age eligibility criteria for high non-tryers, the cell counts for age 35+ are not zero)
  2. ^includes women who report two or more races. For age categories, P < 0.05; For race and ethnicity, P < 0.01