Breast cancer risk ratio of first degree relatives of breast cancer probands according to calendar period and type of relationship
| Time period | Mothers | Sisters | Daughters | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No of cases | Risk ratio | 95% CI | No of cases | Risk ratio | 95% CI | No of cases | Risk ratio | 95% CI | |||
| 1921–1935 | 6 | 2.16 | 0.79–4.70 | 0 | 1 | 2.99 | 0.06–16.5 | ||||
| 1936–1950 | 16 | 2.50 | 1.28–3.72 | 7 | 3.16 | 1.28–6.53 | 0 | ||||
| 1951–1965 | 21 | 2.06 | 1.18–2.94 | 18 | 2.23 | 1.20–3.26 | 3 | 2.52 | 0.55–7.39 | ||
| 1966–1980 | 20 | 1.82 | 1.03–2.62 | 64 | 3.10 | 2.34–3.85 | 5 | 2.36 | 0.79–5.55 | ||
| 1981–1995 | 12 | 1.55 | 0.67–2.43 | 69 | 2.11 | 1.61–2.61 | 13 | 1.98 | 0.90–3.05 | ||