Table 2. Baseline clinical characteristics of TNBC patients and controls.
| Cases (n = 191) | Controls (n = 192) | P valuea | |
| No.(%) | No.(%) | ||
| Age(years) | 0.161 | ||
| ≤40 | 43 (22.5) | 56 (29.2) | |
| >40 | 148 (77.5) | 136 (70.8) | |
| Family history of breast cancer or ovarian cancerb | 0.000 | ||
| No | 171 (89.5) | 189 (98.4) | |
| Yes | 20 (10.5) | 3 (1.6) | |
| Age of menarche (years) | 0.030 | ||
| ≤14 | 93 (48.7) | 72 (37.5) | |
| >14 | 98 (51.3) | 120 (62.5) | |
| Menopausal status at diagnosis | 0.018 | ||
| Premenopausal | 119 (62.3) | 96 (50.0) | |
| Postmenopausal | 72 (37.7) | 96 (50.0) | |
| Smoking level (life-time cigarettes smoked) | 0.503 | ||
| <20 | 187 (97.9) | 186 (96.9) | |
| ≥20 | 3 (1.6) | 6 (3.1) | |
| Unknown | 1 (0.5) | 0 (0) |
a
Two-sided χ2 test.
b
First-degree relative or second-degree relative with breast cancer or ovarian cancer.