Table 3.

Odds Ratios for Invasive Epithelial Ovarian Cancer (Multivariable Logistic Regression Models) in African-American and White Women, North Carolina Ovarian Cancer Study, 1999–2008

	Whites						African Americans
	Cases		Controls		ORa	95% CI	Cases		Controls		ORa	95% CI
	No.	%	No.	%			No.	%	No.	%
Age, years (continuous variable)	715		837		1.01	1.00, 1.02	106		181		1.00	1.00, 1.02
No. of pregnancies
0	114	15.9	84	10.0	1.00	Referent	14	13.2	11	6.1	1.00	Referent
1–2	306	42.8	332	39.7	0.66	0.47, 0.94	29	27.4	68	37.6	0.28	0.09, 0.86
≥3	295	41.3	421	50.3	0.46	0.32, 0.65	63	59.4	102	56.4	0.52	0.17, 1.62
Age at menarche, years
<12	172	24.1	151	18.0	1.00	Referent	26	24.5	52	28.7	1.00	Referent
≥12	543	75.9	686	82.0	0.65	0.50, 0.84	80	75.5	129	71.3	1.30	0.67, 2.53
Tubal ligation
No	535	74.8	561	67.0	1.00	Referent	73	68.9	89	49.2	1.00	Referent
Yes	180	25.2	276	33.0	0.74	0.58, 0.94	33	31.1	92	50.8	0.43	0.24, 0.80
Duration of oral contraceptive use, years
Never use	233	34.1	225	27.6	1.00	Referent	45	43.3	55	32.0	1.00	Referent
<1	95	13.9	88	10.8	1.18	0.82, 1.69	15	14.4	14	8.1	1.89	0.73, 4.95
1–<5	162	23.7	222	27.2	0.78	0.58, 1.05	23	22.1	55	32.0	0.72	0.34, 1.53
≥5	193	28.3	281	34.4	0.73	0.54, 0.97	21	20.2	48	27.9	0.52	0.24, 1.15
Missing data	32		21				2		9
Family history of breast or ovarian cancer
No	559	78.2	697	83.3	1.00	Referent	66	62.3	153	84.5	1.00	Referent
Yes	156	21.8	140	16.7	1.31	1.00, 1.72	40	37.7	28	15.5	2.73	1.45, 5.14
Body mass indexb 1 year before diagnosis/interview
<25	309	43.2	368	44.0	1.00	Referent	17	16.0	31	17.1	1.00	Referent
25–<30	211	29.5	254	30.3	0.92	0.71, 1.18	26	24.5	58	32.0	0.96	0.40, 2.30
30–<35	112	15.7	122	14.6	1.17	0.85, 1.61	22	20.8	43	23.8	1.32	0.53, 3.26
≥35	83	11.6	93	11.1	1.03	0.72, 1.47	41	38.7	49	27.1	1.52	0.65, 3.56

Abbreviations: CI, confidence interval; OR, odds ratio.

^aAdjusted for all of the variables in the table.

^bWeight (kg)/height (m)².