Results from analysis of family histories of patients from one consultant surgeon’s practice
| Number | % | |
| Full family history | 479 | — |
| Male | 261 | 54 |
| Female | 218 | 46 |
| Mean age (years) | 69 | — |
| Range | 28–94 | — |
| Number of first degree relatives with colorectal cancer | ||
| None | 384 | 80 |
| One | 80 | 17 |
| Two | 10 | 2.5 |
| Patients with early onset cancer (< 50 years), no family history (mean age 43 years) | 15 | 3 |
| Patients with FAP | 1 | 0.2 |
| Patients from families meeting the Amsterdam criteria | 4 | 0.8 |