Table 1.
Characteristics of the study participants, showing mean and standard deviation (SD) for continuous characteristics and frequency and percentage for categorical characteristics
| Characteristic | Controls (n = 1016) | Cases (n = 289) | Ovarian cancer cases (n = 165) | Endometrial cancer cases (n = 131)a | ||||
|---|---|---|---|---|---|---|---|---|
| Mean or n | SD or % | Mean or n | SD or % | Mean or n | SD or % | Mean or n | SD or % | |
| Age [years] | 60.9 | 9.3 | 62.1 | 11.1 | 59.5 | 11.1 | 65.6 | 10.5 |
| Body mass index [kg/m2] | 25.5 | 4.3 | 27 | 5.8 | 26 | 4.7 | 28.3 | 6.9 |
| Self-reported endometriosis | ||||||||
| No | 995 | 97.9 | 275 | 95.2 | 158 | 95.8 | 124 | 94.7 |
| Yes | 21 | 2.1 | 14 | 4.8 | 7 | 4.2 | 7 | 5.3 |
| Oral contraceptive use | ||||||||
| No | 275 | 27.1 | 141 | 48.8 | 72 | 43.6 | 71 | 54.2 |
| Yes | 741 | 72.9 | 148 | 51.2 | 93 | 56.4 | 60 | 45.8 |
| Pregnancies (n) | ||||||||
| 0 | 121 | 11.9 | 41 | 14.2 | 14 | 8.5 | 27 | 20.6 |
| 1 | 165 | 16.2 | 62 | 21.5 | 31 | 18.8 | 32 | 24.4 |
| 2 | 373 | 36.7 | 100 | 34.6 | 66 | 40.0 | 37 | 28.2 |
| 3 | 219 | 21.6 | 52 | 18.0 | 35 | 21.2 | 19 | 14.5 |
| 4+ | 138 | 13.6 | 34 | 11.8 | 19 | 11.5 | 16 | 12.2 |
aSummed up numbers of ovarian and endometrial cancer cases is larger than 289, because there were cases with both ovarian and endometrial cancer