Relative risk (RR) for breast cancer by age of affected first degree female relatives
| Age at diagnosis in first degree relatives | RR for women < 50 y (99% CI) | RR for women ≥ 50 y (CI) |
|---|---|---|
| < 40 y | 13.5 (3.4 to 53.9) | 3.9 (1.8 to 8.6) |
| ≥ 40 y | 7.8 (2.4 to 25.0) | 2.6 (1.8 to 3.7) |