Characteristics of the eligible participants on surveillance.
| All n=764 | BRCA1 n=339 | BRCA2 n=410 | BRCA1&2 n=6 | BRCA variant unknown* n=9 | |
| Median age at recruitment Years (range) | 40.0 (34.5–83.3) | 39.4 (35.4–81.4) | 40.8 (35.1–83.3) | 44.8 (36.1–63.4) | 36.5 (35.2–40.1) |
| Number Premenopausal (%) | 590 (77.2%) | 269 (79.4%) | 306 (74.6%) | 3 (50%) | 9 (100%) |
*Unable to obtain medical report stating which BRCA variant they had.