Table 1: Frequencies of demographic and reproductive characteristics by case/control status.

VariableCase subjects no. (%)Control subjects no. (%) (P value)

Age group, years
24–49135 (25.9)204 (26.6)9.29 (.026)
50–56111 (21.3)208 (27.2)
57–66129 (24.8)187 (24.4)
≥67146 (28.0)167 (21.8)

Ethnic group
White495 (95.0)736 (96.1)1.14 (.57)
Black19 (3.6)20 (2.6)
Other7 (1.3)10 (1.3)

Education
Less than high school46 (8.8)37 (4.8)13.56 (.001)
High school180 (34.5)229 (29.9)
Posthigh school295 (56.6)500 (65.3)

Family history of ovarian cancer
No487 (95.3)731 (97.3)3.74 (.053)
Yes24 (4.7)20 (2.7)

Live births
None124 (23.8)104 (13.6)22.23 (.000)
Any397 (76.2)662 (86.4)

Tubal ligation
No389 (78.3)490 (65.0)25.3 (.000)
Yes108 (21.7)264 (35.0)

Oral Contraception, years
0223 (42.8)214 (27.9)40.02 (.000)
<1–4205 (39.3)321 (41.9)
5–959 (11.3)134 (17.5)
≥1034 (6.5)97 (12.7)

Menopausal status
Premenopausal142 (30.4)194 (29.9).028 (.87)
Postmenopausal325 (69.6)454 (70.1)

Self-report PID
No515 (98.8) 759 (99.1).18 (.68)
Yes6 (1.2)7 (0.9)

Self-report gonococcal or chlamydial cervicitis
No502 (96.4)736 (96.1).062 (.80)
Yes19 (3.6)30 (3.9)