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Treatment characteristics
| Characteristics | Age <35 (%) | Age ≥ 35 (%) | P value |
| Surgery | |||
| Mastectomy | 211 (82.4) | 1482 (83.1) | 0.796 |
| Conservation | 45 (17.6) | 302 (16.9) | |
| Chemotherapy | |||
| Lymph node (-) | 65/138 (47.1) | 421/1063 (39.6) | 0.281 |
| Lymph node (+) | 109/118 (92.4) | 627/721 (87.0) | 0.674 |
| Radiation therapy | 73 (28.5) | 462 (25.9) | 0.373 |
| Hormone therapy | 54 (21.1) | 492 (27.6) | 0.028 |
