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Observed-to-expected ratio for invasive plus in situ breast cancer, stratified by degree of relatedness to closest relative with known BRCA mutation
| No. of Subjects |
Mean age at cohort entry (years) |
Mean follow-up (years) | O/E (95% CI) | |
|---|---|---|---|---|
| 1st degree | 102 | 36.8 | 19.9 | 0.66 (0.13–1.94) |
| 2nd degree | 182 | 31.8 | 17.8 | 0.97 (0.35–2.11) |
| 3rd degree | 111 | 25.4 | 15.4 | 0.69 (0.01–3.83) |
