Relative risk (RR) for breast cancer (BC) by age of affected first degree female relatives
| Age at diagnosis of BC in first degree relatives | RR for women <50 years (95% CI) | RR for women ≥ 50 years (CI) |
|---|---|---|
| <40 years | 13.5 (3.4 to 53.9) | 3.9 (1.8 to 8.6) |
| ≥40 years | 7.8 (2.4 to 25.0) | 2.6 (1.8 to 3.7) |