Table 6. The characteristics of breast cancer cases and cancer-free controls.
| Characteristics | Cases | Controls | P | |
|---|---|---|---|---|
| Number | 560 | 583 | ||
| Age (mean ± SD) | 49.09±11.02 | 48.80±8.28 | 0.612 | |
| Menopausal status | ||||
| Premenopausal | 264 | 281 | ||
| Postmenopausal | 296 | 302 | 0.716 | |
| Procreative times | ||||
| <2 | 289 | 291 | 0.594 | |
| ≥2 | 271 | 292 | ||
| Body mass index (kg/m2) | ||||
| (mean ± SD) | 22.52±2.84 | 22.95±3.21 | 0.038 | |
| Tumor size | <2 cm | 188 | ||
| ≥2 cm | 372 | |||
| LN metastasis | Negative | 236 | ||
| Positive | 324 | |||
| ER | Negative | 247 | ||
| Positive | 313 | |||
| PR | Negative | 255 | ||
| Positive | 305 | |||
| Her-2 | Negative | 389 | ||
| Positive | 171 | |||
LN: lymph node; ER: estrogen receptor; PR: progesterone receptor; Her-2: human epidermal growth factor receptor-2.