Characteristic | Oral contraceptive usea | P-valueb | ||
---|---|---|---|---|
 | Never-Used | Ever-Used | Total |  |
n = 571 | n = 827 | n = 1398 | Â | |
(%) | (%) | (%) | Â | |
Age at diagnosis, median in years (range) | 69 (24, 93) | 58 (21, 91) | 61 (21, 93) | <0.0001 |
Cancer stage | Â | Â | Â | Â |
 1 | 77 (14) | 149 (19) | 226 (17) | 0.07 |
 2 | 34 (6) | 44 (6) | 78 (6) |  |
 3 | 322 (60) | 460 (59) | 782 (60) |  |
 4 | 106 (20) | 124 (16) | 230 (17) |  |
Tumor Type | Â | Â | Â | Â |
 High-grade serous | 320 (56) | 419 (51) | 739 (53) | 0.09 |
 Endometrioid | 71 (12) | 91 (11) | 162 (12) |  |
 Clear cell | 32 (6) | 46 (6) | 78 (6) |  |
 Mucinous | 9 (2) | 23 (3) | 32 (2) |  |
 Other | 139 (24) | 147 (29) | 387 (27) |  |
Grade | Â | Â | Â | Â |
 1 | 22 (5) | 49 (8) | 71 (7) | 0.06 |
 2 | 45 (10) | 77 (12) | 122 (11) |  |
 3 | 260 (58) | 362 (58) | 622 (58) |  |
 4 | 123 (27) | 140 (22) | 263 (24) |  |
Tumor Debulking Status | Â | Â | Â | Â |
 No residual disease | 218 (39) | 393 (48) | 611 (45) | 0.004 |
 Less than or equal to 1 centimeter | 150 (27) | 172 (21) | 322 (24) |  |
 Optimal but amount of residual disease unknown | 79 (14) | 105 (13) | 184 (13) |  |
 Suboptimal | 79 (14) | 86 (11) | 165 (12) |  |
 Unknown | 33 (6) | 57 (7) | 90 (7) |  |
Platinum-based chemotherapy within 3 months of surgery | Â | Â | Â | Â |
 Yes | 309 (87) | 530 (93) | 839 (90) | 0.002 |
 No | 48 (13) | 42 (7) | 90 (10) |  |
Age at menarche, median in years (range) | 13 (9, 19) | 13 (8, 19) | 13 (8, 19) | 0.19 |
Age at menopause, median in years (range) | 50 (18, 76) | 50 (21, 60) | 50 (18, 76) | 0.26 |
Number of live births | Â | Â | Â | Â |
 0 | 113 (20) | 139 (17) | 252 (18) | <0.0001 |
 1-2 | 177 (31) | 374 (45) | 551 (40) |  |
 3 or more | 278 (49) | 313 (38) | 591 (42) |  |
Smoking | Â | Â | Â | Â |
 Never | 342 (66) | 480 (62) | 822 (64) | 0.25 |
 Former | 136 (26) | 234 (30) | 370 (29) |  |
 current | 38 (7) | 63 (8) | 101 (8) |  |
Breast or ovarian cancer in a first-degree relative | Â | Â | Â | Â |
 Yes | 133 (24) | 188 (23) | 321 (23) | 0.75 |
 No | 426 (76) | 628 (77) | 1054 (77) |  |