Table 1.
Participant characteristics
| Characteristics | Cases (n=432) |
Controls (n=491) |
P value for the chi-square test |
|---|---|---|---|
| No. (%) | No. (%) | ||
| Age, years | |||
| < 45 | 75 (17) | 93 (19) | |
| 45–54 | 121 (28) | 140 (29) | |
| 55–64 | 113 (26) | 144 (29) | |
| ≥ 65 | 123 (29) | 114 (23) | 0.30 |
| Ethnicity | |||
| Caucasian | 104 (24) | 114 (23) | |
| Japanese | 122 (28) | 137 (28) | |
| Hawaiian | 59 (14) | 107 (14) | |
| Filipina | 84 (19) | 68 (22) | |
| Other | 63 (15) | 65 (13) | 0.91 |
| Education, years | |||
| ≤ 12 | 172 (40) | 155 (32) | |
| 13–14 | 133 (31) | 162 (33) | |
| ≥ 15 | 127 (29) | 174 (35) | 0.03 |
| Parity | |||
| nulliparous | 119 (28) | 76 (15) | |
| 1–2 | 167 (39) | 190 (39) | |
| 3 or more | 146 (34) | 225 (46) | <0.0001 |
| Used contraceptive hormones | 185 (43) | 330 (67) | <0.0001 |
| Postmenopausal | 306 (71) | 312 (64) | 0.02 |
| Used menopausal hormones | 178 (58) | 149 (48) | 0.01 |
| Stage at diagnosis | |||
| localized (IA and IB) | 128 (30) | ||
| regional (IC and II) | 111 (26) | ||
| distant (III–IV) | 182 (42) | ||
| not available | 11 (2) | ||
| Tumor histological type | |||
| serous | 196 (45) | ||
| endometrioid | 75 (17) | ||
| clear cell | 52 (12) | ||
| mucinous | 45 (10) | ||
| mixed | 11 (3) | ||
| other | 53 (12) | ||