| Cases* N = 264 | Controls* N = 625 | P** | ||
---|---|---|---|---|---|
Study site, N % | |||||
   Warsaw | 177 | 67% | 423 | 68% | 0.85 |
   Lodz | 87 | 33% | 202 | 32% |  |
Age, mean SD in years | 56.3 | 10.8 | 56.1 | 10.8 | 0.83 |
No. of full-term births, N % | |||||
   Nulliparous | 50 | 19% | 79 | 13% | <0.0001 |
   1 | 101 | 38% | 176 | 28% |  |
   2 | 94 | 36% | 273 | 44% |  |
   ≥ 3 | 19 | 7% | 97 | 16% |  |
Number of ovulatory cycles, mean SD | 410.9 | 71.1 | 398.1 | 81.3 | 0.03 |
Use of oral contraceptive, N % | |||||
   Never | 245 | 94% | 556 | 90% | 0.08 |
   Ever | 16 | 6% | 60 | 10% |  |
Currently having menstrual periods, N % | |||||
   No | 182 | 71% | 401 | 66% | 0.40 |
   Yes | 75 | 29% | 203 | 34% |  |
   Unclear | 7 | 3% | 20 | 3% |  |
Use of oral hormone replacement therapy among post-menopausal women | |||||
   Never | 146 | 81% | 325 | 82% |  |
   Ever | 35 | 19% | 70 | 18% | 0.15 |
Family history of breast or ovarian cancer in first-degree relatives, N % | |||||
   No | 210 | 80% | 553 | 88% | 0.001 |
   Breast cancer only | 26 | 10% | 24 | 4% |  |
   Ovarian cancer only | 26 | 10% | 40 | 6% |  |
   Both | 2 | 1% | 8 | 1% |  |
Tumor Characteristics | |||||
Histology, N (%) | |||||
   Serous | 118 | 45% |  |  |  |
   Mucinous | 26 | 10% |  |  |  |
   Endometrioid | 58 | 22% |  |  |  |
   Clear cell | 14 | 5% |  |  |  |
   Mixed | 18 | 7% |  |  |  |
   Others or unclassified | 30 | 11% |  |  |  |
Stage, N % distant | 110 | 62% | Â | Â | Â |
   Not staged or missing | 86 |  |  |  |  |
Grade of differentiation, N % | |||||
   Well | 21 | 13% |  |  |  |
   Moderate | 59 | 35% |  |  |  |
   Poor | 88 | 52% |  |  |  |
   Missing | 96 |  |  |  |  |