Proportion of unaffected female first degree relatives of BRCA1/2 mutation carriers testing positive for the family mutation from all four studies
| Age at testing | Testing positive | Testing negative | Proportion positive |
|---|---|---|---|
| <30 | 102 | 76 | 57% (p = 0.2) |
| 30–49 | 218 | 192 | 54% |
| 50+ | 47 | 112 | 30% |
| Total | 367 | 380 | 49% |









