Breast cancer risk ratio of relatives of breast cancer probands according to calendar period and degree of relationship
| Time | 1st degree | 2nd degree | 3rd degree | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No of cases | Risk ratio (95% CI) | No of cases | Risk ratio (95% CI) | No of cases | Risk ratio (95% CI) | ||||||
| 1921–1935 | 7 | 1.78 (0.71–3.66) | 33 | 1.60 (1.10–2.26) | 11 | 2.64 (1.32–4.73) | |||||
| 1936–1950 | 23 | 2.44 (1.55–3.67) | 51 | 1.47 (1.09–1.94) | 12 | 1.07 (0.55–1.87) | |||||
| 1951–1965 | 42 | 2.15 (1.55–2.91) | 80 | 1.62 (1.19–2.02) | 42 | 1.52 (1.09–2.04) | |||||
| 1966–1980 | 89 | 2.63 (2.13–3.21) | 83 | 1.43 (1.15–1.79) | 91 | 1.58 (1.28–1.96) | |||||
| 1981–1995 | 94 | 2.00 (1.62–2.46) | 97 | 1.54 (1.25–1.87) | 153 | 1.58 (1.34–1.86) | |||||