TABLE 4.

Multivariate adjusted interaction between gestational age of preeclampsia in first pregnancy and maternal ethnic origin on preterm delivery in normotensive second pregnancy, Missouri, 1989–2005 (n = 12,835)

	Preterm delivery
Gestational timing of preeclampsia in first pregnancy by maternal ethnic origin	aOR†‡	95% CI†
Non-Hispanic White and late onset	1.0	Reference
Early onset of preeclampsia only	3.71	2.81, 4.90
African American only	2.43	1.86, 3.17
Early onset preeclampsia and African American	5.45	3.62, 8.21

^†adjusted odds ratios and 95% confidence interval

^‡the multivariate model includes gestational timing of preeclampsia in first pregnancy, maternal age, ethnic origin, marital status, smoking during pregnancy, Medicaid use, BMI, and inter-inter-pregnancy interval, gestational timing of preeclampsia in first pregnancy and maternal ethnic origin product term