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| Diagnostic clinical breast examination n (%) | Total | ||
| Negative | Positive | ||
| Mammography | |||
| Negative | 6 (1,2) | 47 (9,0) | 53 (10,2) |
| Positive | 52 (10,0) | 416 (89,8) | 468 (89,8) |
| Total | 58 (11,1) | 463 (88,9) | 521 (100,0) |
| Breast ultrasonography | |||
| Negative | 16 (1,6) | 33 (3,3) | 49 (4,9) |
| Positive | 86 (8,6) | 863 (86,5) | 949 (95,1) |
| Total | 102 (10,2) | 896 (89,8) | 998 (100,0) |
