Relative risk (RR) for breast cancer by number of affected first degree female relatives
| Number of first degree relatives | RR for women < 50 years (99% CI) | RR for women ≥ 50 years (CI) |
|---|---|---|
| 1 | 2.14 (1.92 to 2.38) | 1.65 (1.53 to 1.78) |
| 2 | 3.84 (2.37 to 6.22) | 2.61 (2.03 to 3.34) |
| 3 | 12.05 (1.70 to 85.16) | 2.65 (1.29 to 5.46) |