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Baseline characteristics of the patients.
| Variable | N | % | Mean | Standard deviation |
|---|---|---|---|---|
| Age | 1401 | 100 | 52.45 years old | 11.05 years old |
| Stage | ||||
| I | 276 | 19.7 | ||
| IIA | 452 | 32.3 | ||
| IIB | 296 | 21.1 | ||
| IIIA | 188 | 13.4 | ||
| IIIB | 49 | 3.5 | ||
| IIIC | 86 | 6.1 | ||
| Unknown | 54 | 3.9 | ||
| Menopausal status | ||||
| Premenopausal | 548 | 39.1 | ||
| Postmenopausal | 758 | 54.1 | ||
| Unknown | 95 | 6.8 | ||
| ER and PR status | ||||
| ER+ PR+ | 669 | 47.8 | ||
| ER+ PR – | 166 | 11.8 | ||
| ER– PR+ | 26 | 1.9 | ||
| ER– PR– | 476 | 33.9 | ||
| Unknown | 64 | 4.6 | ||
