Table 3.

Associations between preterm birth and racial isolation and educational isolation ^a.

	Odds Ratios (95% Confidence Interval)
	NH Black	NH White
RI of non-Hispanic Blacks	1.11 (1.07, 1.15)	1.16 (1.10, 1.22)
EI of non-college educated individuals	1.07 (1.02, 1.12)	1.03 (1.00, 1.05)

^a Models adjusted for individual-level characteristics, including maternal age at time of giving birth (15–19, 20–24, 25–29, 30–34, 35–40, or 40–44 years), maternal educational attainment (not a high school graduate; high school graduate; or college graduate), maternal marital status at time of birth (married or unmarried), maternal tobacco use during pregnancy, and infant sex. The census tract of maternal residence at time of birth was included as a random effect.