| Sociodemographic characteristics | Unweighted number in sample | Weighted percent in sample |
| Child born prematurely (<37 weeks of gestation) | | | Premature | 9,590 | 11.45 | Not premature | 75,095 | 88.55 | Child’s birthweight | | | Very low birthweight (<1,500 g) | 1,255 | 1.68 | Moderately low birthweight (1,500–2,499 g) | 6,137 | 7.85 | Normal birthweight (≥2,500 g) | 73,626 | 90.47 | Child’s age (years) | | | 2–5 | 19,942 | 24.37 | 6–11 | 31,030 | 37.32 | 12–17 | 34,563 | 38.31 | Child’s sex | | | Male | 44,178 | 51.22 | Female | 41,357 | 48.78 | Race/ethnicity | | | Hispanic | 11,136 | 22.55 | Non-Hispanic white | 55,235 | 51.58 | Non-Hispanic black | 8,073 | 13.43 | Non-Hispanic mixed race | 4,649 | 4.68 | Other (Asians/Pacific Islanders and American Indians) | 6,442 | 7.76 | Household composition | | | Two-parent biological | 58,306 | 63.08 | Two-parent stepfamily | 6,517 | 9.64 | Single mother | 13,708 | 19.19 | Other family type | 7,004 | 8.10 | Place of residence | | | Metropolitan | 62,845 | 84.35 | Nonmetropolitan | 21,486 | 15.65 | Highest household or parental education level (years) | | | <12 | 4,893 | 11.64 | 12 | 12,771 | 19.91 | 13–15 | 21,500 | 24.66 | 16+ | 44,186 | 43.79 | Household poverty status (ratio of family income to poverty threshold) | | | Below 100% | 12,882 | 21.95 | 100–199% | 15,347 | 21.72 | 200–399% | 26,139 | 28.44 | At or above 400% | 31,167 | 27.90 |
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