Table 2.

Characteristics of Births, Injury Deaths, and Selected Controls, United States, 1983–1991

Characteristic*Percent of Births
(N = 34 895 012)
Percent of Controls
(N = 10 370)
Percent of Injuries
(N = 10 370)
Relative RiskAdjusted OR (95% CI)
Maternal
Marital status
 Unmarried24.724.848.02.811.55 (1.42–1.68)
Married 75.375.252.01.01.0 
Age
 <15 y.3.3.74.432.10 (1.29–3.42)
 15–19 y12.613.025.43.322.51 (2.23–2.82)
 20–24 y28.528.438.22.201.88 (1.74–2.05)
25+ y 58.658.335.71.01.0
Education§
 ≤11 y17.917.836.06.362.31 (2.01–2.66)
 12 y33.333.831.12.961.59 (1.40–1.81)
 13–15 y16.616.910.31.951.36 (1.19–1.56)
16+ y 14.114.64.51.01.0
Previous live births
 2+25.825.934.31.692.14 (1.95–2.36)
 132.531.831.71.241.69 (1.55–1.84)
0 41.141.732.41.01.0
Initiation of prenatal care
 None1.82.17.25.342.11 (1.74–2.54)
 7th–9th mo4.04.58.12.771.34 (1.16–1.54)
 4th–6th mo17.617.626.72.081.35 (1.24–1.46)
1st–3rd mo 74.373.554.21.01.0
Race
 Black16.016.431.72.461.43 (1.31–1.56)
 Native American.91.02.63.442.12 (1.63–2.75)
 Asian3.12.61.7.681.16 (0.91–1.49)
White/Other 79.980.064.11.01.0
Infant
Gender
 Male51.250.354.71.151.20 (1.12–1.28)
Female 48.849.745.31.01.0
Birth weight (g)
 <15001.21.33.22.911.91 (1.51–2.42)
 1500–<25005.75.612.32.421.98 (1.75–2.24)
≥2500 93.093.083.21.01.0
Gestation (wk)
 <28.7.91.82.88N/A
 28–369.18.815.51.95N/A
≥37 87.087.576.21.0N/A
  • * Comparison group in italics.

  • Columns do not total 100% because the “not stated” category is not shown.

  • Adjusted for all characteristics shown with the exception of gestational age.

  • § Education not reported in Washington or in California and Texas (1983–1988).