Age at diagnosis in familial adenomatous polyposis (FAP) patients grouped according to the method of diagnosis
| Diagnosis based on |
No patients |
Known age at diagnosis |
Age at diagnosis of FAP (y) |
No patients with CRC (%) |
Age at diagnosis of CRC (y) |
| Bowel symptoms | 410 | 404 | 32.9 (13.9) [4–78] | 126 (30.7) | 40.1 (12.4) [19–78] |
| Surveillance | 303 | 292 | 25.4 (12.2) [4–64] | 18 (5.9) | 36.9 (9.7) [21–54] |
| “Chance” | 13 | 13 | 40,3 (14.9) [23–63] | 4 (30.8) | 40.5 (6.9) [32–49] |
| Unknown | 530 | 161 | 37.5 (14.8) [8–78] | 45 (8.5) | 44.0 (13.6) [22–76] |
| Total | 1256 | 870 | 193 (15.4) | 40.7 (12.5) [19–78] |
Values are number or mean (SD) [range].