Table 3.

Odd ratios (ORs) and 95% confidence intervals (CIs) for delivering a male infant among 288 009 women delivering liveborn singletons at Kaiser Permanente Northern California, 1996–2008

	Unadjusted (n = 288 009)		Model 1* (n = 285 529)		Model 2† (n = 282 236)
	OR	95% CI	OR	95% CI	OR	95% CI
Maternal glycaemic category
Pregravid diabetes	0.97	0.90, 1.05	0.97	0.90, 1.05	0.96	0.89, 1.04
Normoglycaemic pregnancy	Ref		Ref		Ref
Abnormal screening/normal diagnostic test	1.00	0.98, 1.02	1.00	0.98, 1.02	1.00	0.98, 1.02
Gestational diabetes	1.02	0.99, 1.05	1.02	0.99, 1.05	1.02	0.99, 1.05
Race–ethnicity
African American			0.98	0.95, 1.01	0.98	0.95, 1.01
Hispanic			0.99	0.97, 1.01	0.99	0.97, 1.01
Non-Hispanic Caucasian			Ref		Ref
Asian			1.02	1.00, 1.04	1.02	1.00, 1.04
Other			1.05	0.93, 1.18	1.06	0.94, 1.19
Educational attainment
Less than high school					Ref
High school graduate					1.00	0.98, 1.03
Some college					1.02	0.99, 1.04
College graduate					1.01	0.98, 1.04
Graduate studies					1.00	0.96, 1.03
Age					1.00	1.00, 1.00

^*Adjusted for maternal race–ethnicity.

^†Adjusted for maternal race–ethnicity, educational attainment, and age.