Table 6 Distribution of families from all sites (1996–2003), by history of breast and ovarian cancer and ascertainment source
Number of reported breast and ovarian cancers in familya | Number of families enrolled | ||
|---|---|---|---|
| Â | Population-based case families (n = 6126) | Clinic-based families (n = 2834) | Total families (n = 8960) |
0 | 0 (0%) | 152b (5%) | 152 (1%) |
1 | 3979 (65%) | 1684 (59%) | 5663 (63%) |
2 | 1873 (30%) | 794 (28%) | 2667 (30%) |
3 | 240 (4%) | 178 (63%) | 418 (5%) |
4 | 24 (<1%) | 19 (<1%) | 43 (<1%) |
≥ 5 | 10 (<1%) | 7 (<1%) | 17 (<1%) |