Table 1.

Demographic factors by case-control status

	Controls (%)(n=1832)		Invasive Cases (%)(n=1101)		Borderline Cases (%)(n=389)
Age at reference
35–39	64	(3.5)	38	(3.5)	35	(9.0)
40–44	137	(7.5)	77	(7.0)	53	(13.6)
45–49	243	(13.3)	159	(14.4)	84	(21.6)
50–54	306	(16.7)	187	(17.0)	73	(18.8)
55–59	345	(18.8)	204	(18.5)	60	(15.4)
60–64	330	(18)	221	(20.1)	44	(11.3)
65–69	260	(14.2)	156	(14.2)	30	(7.7)
70–74	147	(8.0)	59	(5.4)	10	(2.6)
Race/ethnicity
Non-Hispanic White	1663	(90.8)	977	(88.7)	347	(89.2)
Non-Hispanic Black	26	(1.4)	9	(0.8)	5	(1.3)
Non-Hispanic Asian	46	(2.5)	53	(4.8)	11	(2.8)
Non-Hispanic Other	48	(2.6)	28	(2.5)	12	(3.1)
Hispanic	49	(2.7)	44	(3.1)	14	(3.6)
Duration of hormonal contraceptive use
Never used	310	(16.9)	285	(25.9)	64	(16.5)
<6 months	122	(6.7)	108	(9.8)	29	(7.5)
6 months to <5 years	676	(36.9)	389	(35.3)	143	(36.8)
5 to <10 years	381	(20.8)	192	(17.4)	79	(20.3)
10+ years	343	(18.7)	127	(11.5)	74	(19.0)
No. of full term pregnancies
0	280	(15.3)	268	(24.3)	102	(26.2)
1	249	(13.6)	188	(17.1)	65	(16.7)
2	617	(33.7)	316	(28.7)	120	(30.9)
3+	686	(37.4)	329	(29.9)	102	(26.2)
BMI at age 30
<18.5	122	(6.7)	64	(5.8)	23	(5.9)
18.5–24.9	1393	(76.0)	807	(73.3)	265	(68.1)
25–59.9	211	(11.5)	133	(12.1)	66	(17.0)
30+	106	(5.8)	97	(8.8)	35	(9.0)
Highest attained education
High school or less	395	(21.6)	266	(24.2)	102	(26.2)
Some college	672	(36.7)	393	(35.7)	152	(39.1)
College graduate	442	(24.1)	260	(23.6)	92	(23.7)
Post graduate	321	(17.5)	179	(16.3)	43	(11.1)
Unknown	2	(<1)	3	(<1)	0	(0)
Total number of jobs worked over lifetime
0	62	(3.4)	40	(3.6)	12	(3.1)
1	307	(16.8)	186	(16.9)	76	(19.5)
2	405	(22.1)	207	(18.8)	87	(22.4)
3	351	(19.2)	224	(20.4)	74	(19.0)
4	269	(14.7)	159	(14.4)	54	(13.9)
≥5	438	(23.9)	285	(25.9)	86	(22.1)
Chronotype
Morning type	972	(53.1)	584	(53.0)	183	(47.0)
Evening type	652	(35.6)	411	(37.3)	179	(46.0)
Other	207	(11.4)	106	(9.6)	27	(6.9)
Don’t know	1	(<1)	0	(0)	0	(0)