Table 2.
Participant characteristics by racial and ethnic groupa
| Variable | Asianb | Native Hawaiian/Pacific Islander b | Hispanic | White, non-Hispanic | ||||
|---|---|---|---|---|---|---|---|---|
| Cases, no. (%) | Controls, no. (%) | Cases, no. (%) | Controls, no. (%) | Cases, no. (%) | Controls, no. (%) | Cases, no. (%) | Controls, no. (%) | |
| Total no. | 785 | 949 | 99 | 167 | 505 | 644 | 9981 | 14 208 |
| Age at reference, yc | ||||||||
| 18-29 | 13 (1.7) | 44 (4.6) | 2 (2.0) | 19 (11.4) | 7 (1.4) | 45 (7.0) | 79 (0.8) | 256 (1.8) |
| 30-39 | 86 (10.9) | 107 (11.3) | 14 (14.1) | 22 (13.2) | 42 (8.3) | 84 (13.0) | 406 (4.1) | 889 (6.3) |
| 40-49 | 223 (28.4) | 256 (27.0) | 18 (18.2) | 39 (23.4) | 123 (24.4) | 187 (29.0) | 1611 (16.1) | 2701 (19.0) |
| 50-59 | 218 (27.8) | 261 (27.5) | 36 (36.4) | 37 (22.2)) | 166 (32.9) | 181 (28.1) | 3150 (31.6) | 4341 (30.6) |
| 60-69 | 145 (18.5) | 146 (15.4) | 21 (21.2) | 35 (21.0) | 115 (22.8) | 113 (17.6) | 2969 (29.8) | 3859 (27.2) |
| ≥70 | 100 (12.7) | 135 (14.2) | 8 (8.1) | 15 (9.0) | 52 (10.3) | 34 (5.3) | 1766 (17.7) | 2162 (15.2) |
| Age at menarche, y | ||||||||
| <12 | 144 (18.6) | 207 (21.9) | 28 (28.6) | 57 (34.1) | 119 (23.8) | 163 (25.7) | 1908 (20.0) | 2702 (19.4) |
| 12-13 | 363 (47.0) | 440 (46.6) | 48 (49.0) | 75 (44.9) | 255 (50.9) | 301 (47.5) | 5267 (55.3) | 7653 (55.0) |
| ≥14 | 266 (34.4) | 297 (31.5) | 22 (22.5) | 35 (21.0) | 127 (25.4) | 170 (26.8) | 2358 (24.7) | 3566 (25.6) |
| Missing data | 12 | 5 | 1 | 0 | 4 | 10 | 448 | 287 |
| Education | ||||||||
| <High school | 100 (13.1) | 83 (9.0) | 17 (17.2) | 9 (5.4) | 136 (34.3) | 129 (25.5) | 856 (9.3) | 781 (5.9) |
| ≥High school | 663 (86.9) | 837 (91.0) | 82 (82.8) | 158 (94.6) | 260 (65.7) | 376 (74.5) | 8334 (90.7) | 12487 (94.1) |
| Missing data | 22 | 29 | 0 | 0 | 109 | 139 | 791 | 940 |
| OC use | ||||||||
| Never | 523 (67.1) | 454 (48.0) | 59 (59.6) | 54 (32.3) | 258 (51.5) | 258 (40.8) | 3746 (39.0) | 3765 (27.0) |
| <5 y | 185 (23.8) | 300 (31.7) | 29 (29.3) | 82 (49.1) | 165 (32.9) | 222 (35.1) | 3261 (33.9) | 4557 (32.7) |
| ≥5 y | 71 (9.1) | 192 (20.3) | 11 (11.1) | 31 (18.6) | 78 (15.6) | 153 (24.2) | 2607 (27.1) | 5631 (40.4) |
| Missing data | 6 | 3 | 0 | 0 | 4 | 11 | 367 | 255 |
| Parity | ||||||||
| 0 live births | 266 (34.1) | 176 (18.6) | 27 (27.6) | 17 (10.2) | 98 (19.5) | 93 (14.7) | 2360 (24.3) | 2388 (17.0) |
| 1 | 133 (17.0) | 153 (16.1) | 13 (13.3) | 19 (11.4) | 72 (14.3) | 85 (13.4) | 1323 (13.6) | 1801 (12.8) |
| 2 | 186 (23.8) | 300 (31.6) | 25 (25.5) | 30 (18.0) | 116 (23.1) | 165 (26.0) | 2925 (30.1) | 4898 (34.8) |
| ≥3 | 196 (25.1) | 320 (33.7) | 33 (33.7) | 101 (60.5) | 216 (43.0) | 292 (46.0) | 3122 (32.1) | 4993 (35.5) |
| Missing data | 4 | 0 | 1 | 0 | 3 | 9 | 251 | 128 |
| Tubal ligation | ||||||||
| No | 683 (87.8) | 733 (78.1) | 85 (85.9) | 97 (58.1) | 408 (82.4) | 462 (74.3) | 7130 (81.5) | 8855 (75.9) |
| Yes | 95 (12.2) | 206 (21.9) | 14 (14.1) | 70 (41.9) | 87 (17.6) | 160 (25.7) | 1624 (18.6) | 2815 (24.1) |
| Missing data | 7 | 10 | 0 | 0 | 10 | 22 | 1227 | 2538 |
| Breastfeedingd | ||||||||
| No | 136 (27.2) | 167 (22.1) | 22 (31.9) | 38 (25.3) | 113 (35.8) | 135 (32.5) | 2294 (39.0) | 2802 (30.4) |
| Yes | 364 (72.8) | 590 (77.9) | 47 (68.1) | 112 (74.7) | 203 (64.2) | 281 (67.6) | 3596 (61.1) | 6416 (69.6) |
| Missing data | 15 | 16 | 2 | 0 | 88 | 126 | 1480 | 2474 |
| Menopausal status | ||||||||
| Pre/perimenopause | 333 (42.9) | 455 (48.6) | 33 (33.7) | 77 (46.4) | 174 (34.9) | 320 (50.2) | 2506 (25.8) | 4392 (31.5) |
| Postmenopause | 444 (57.1) | 481 (51.4) | 65 (66.3) | 89 (53.6) | 325 (65.1) | 318 (49.8) | 7178 (74.1) | 9541 (68.5) |
| Missing data | 8 | 13 | 1 | 1 | 6 | 6 | 297 | 275 |
| Postmenopausal hormone usee | ||||||||
| No | 272 (61.4) | 262 (54.5) | 51 (78.5) | 58 (65.2) | 206 (63.4) | 195 (61.7) | 3566 (51.0) | 4576 (48.4) |
| Yes | 171 (38.6) | 219 (45.5) | 14 (21.5) | 31 (34.8) | 119 (36.6) | 121 (38.3) | 3423 (49.0) | 4879 (51.6) |
| Missing data | 1 | 0 | 0 | 0 | 0 | 4 | 189 | 86 |
| Endometriosis | ||||||||
| No | 524 (87.6) | 696 (92.7) | 90 (93.8) | 155 (94.5) | 412 (93.4) | 526 (95.6) | 7161 (89.2) | 10416 (92.3) |
| Yes | 74 (12.4) | 55 (7.3) | 6 (6.3) | 9 (5.5) | 29 (6.6) | 24 (4.4) | 864 (10.8) | 868 (7.7) |
| Missing data | 187 | 198 | 3 | 3 | 64 | 94 | 1956 | 2924 |
| Hysterectomy | ||||||||
| No | 699 (90.2) | 876 (92.5) | 90 (90.9) | 151 (90.4) | 395 (82.10) | 555 (89.1) | 6473 (80.0) | 9881 (82.9) |
| Yes | 76 (9.8) | 71 (7.5) | 9 (9.1) | 16 (9.6) | 86 (17.9) | 68 (10.9) | 1619 (20.0) | 2033 (17.1) |
| Missing data | 6 | 0 | 0 | 0 | 15 | 10 | 307 | 45 |
| BMI, recentf | ||||||||
| <18.5 kg/m2 | 31 (5.2) | 28 (3.8) | 0 | 2 (1.2) | 4 (0.9) | 4 (0.7) | 170 (2.1) | 235 (2.1) |
| 18.5-24.9 | 366 (61.7) | 495 (66.4) | 27 (28.4) | 53 (32.3) | 163 (37.1) | 231 (42.2) | 3634 (44.9) | 5473 (48.5) |
| 25.0-29.9 | 140 (23.6) | 177 (23.7) | 31 (32.6) | 44 (26.8) | 142 (32.4) | 179 (32.7) | 2351 (29.1) | 3267 (29.0) |
| 30.0-34.9 | 38 (6.4) | 38 (5.1) | 17 (17.9) | 27 (16.5) | 70 (16.0) | 71 (13.0) | 1118 (13.8) | 1419 (12.6) |
| ≥35.0 | 18 (3.0) | 8 (1.1) | 20 (21.1) | 38 (23.2) | 60 (13.7) | 63 (11.5) | 819 (10.1) | 883 (7.8) |
| Missing data | 192 | 203 | 4 | 3 | 66 | 96 | 1889 | 2931 |
(Table continues)