Table 2
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)