Table 1
Relative risk (RR) for breast cancer by number of affected first degree female relatives
Number of first degree relatives
RR for women <50 years (95% 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)