TABLE 1

Description of Retrospective Birth Cohort

CharacteristicTotal BirthsPercentage of Births in Gestational Age Categories
EPT 20–27 wkMPT 28–33 wkLPT 34–36 wkTerm 37–40 wkPostterm 41+ wk
Total314 3280.351.817.9985.993.88
Maternal age at birth
 10–14 y11570.784.4112.3679.083.37
 15–17 y16 6580.482.459.7183.084.28
 18–19 y30 3790.432.168.6584.434.32
 20–24 y91 0890.321.788.185.624.19
 25–29 y83 4960.311.527.2587.033.89
 30–34 y60 1330.341.677.4487.093.46
 35–39 y26 7260.392.018.785.743.16
 40+ years46900.582.849.783.92.99
Maternal race/ethnicity
 Non-Hispanic white168 5880.181.37.1287.214.19
 Non-Hispanic black114 6050.652.719.7183.463.46
 Hispanic30 0520.191.216.1288.813.68
Maternal education at birth
 No high school79 6310.342.18.8184.64.16
 High school degree or equivalent107 9860.41.98.1885.63.93
 1–3 y postsecondary education62 5690.391.827.986.33.56
 4+ years postsecondary education59 4430.251.266.6588.163.68
Child race/ethnicity
 Non-Hispanic White164 0440.171.297.1187.264.18
 Non-Hispanic Black116 2550.652.699.783.463.49
 Hispanic34 0290.211.276.2888.493.76
Child gender
 Male159 1790.341.878.3385.663.81
 Female155 1490.361.757.6286.323.95
Child’s year of birth
 199868 3970.331.87.5785.644.64
 199969 7240.371.817.9585.834.04
 200072 8110.411.867.6985.924.12
 200164 3560.331.88.586.073.3
 200239 0170.281.758.3886.842.74
Child’s first-grade CRCT failure
 Math33.0620.1415.612.4613.1
 Reading24.3414.3711.359.3710.13
 ELA33.8823.0919.3416.0217