Table 3.

Adjusted odds ratios and 95% confidence intervals for infant mortality, from the National Center for Health Statistics Natality Files 2003^*

	Estimate (CI)
Prenatal Care (Reference Not Adequate)
Adequate	0.62 (0.58,0.66)
Superadequate	1.04 (0.99,1.09)
Missing	1.96 (1.79,2.13)
Maternal Race/Ethnicity (Reference White Non-Hispanic)
Black Non-Hispanic	1.86 (1.76,1.96)
Hispanic	1.02 (0.95,1.10)
Asian & Pacific Islander	1.17 (1.04,1.31)
Native American	1.29 (1.09,1.52)
Maternal Age in Years (Reference 25–29)
< 15	1.23 (0.89,1.69)
15–19	1.07 (1.00,1.16)
20–24	1.00 (0.95,1.05)
30–34	1.05 (0.99,1.10)
35–39	1.09 (1.01,1.17)
40–45	1.38 (1.22,1.55)
45–49	1.55 (1.06,2.21)
Pregnancy Plurality (%)(Reference Singleton)
Twin	4.67 (4.42,4.94)
Triplet+	13.4 (11.7,15.5)

^*Adjusted also for geographic division, marital status, maternal place of birth, education, gravidity, smoking and drinking during pregnancy, chronic hypertension, preganancy associated hypertension, and eclampsia/pre-eclampsia