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Comparison of MBD between premenopausal and postmenopausal patients.
| MBD | Total | Premenopausal | Postmenopausal | χ2 | P |
| Benign | 34.848 | .000 | |||
| MBD a-b | 52 | 13 (13.40) | 39 (56.52) | ||
| MBD c-d | 114 | 84 (86.60) | 30 (43.48) | ||
| Malignant | 36.817 | .000 | |||
| MBD a-b | 156 | 8 (17.78) | 148 (66.67) | ||
| MBD c-d | 111 | 37 (82.22) | 74 (33.33) |
