| Median age, years (range) | 46 (24–80) |
| Sex, male (%) | 24 (38.7%) |
| Known mismatch repair gene mutation (%)* | 8 (12.9%) |
| Median time from last colonoscopy, months (range) | 24 (12–60) |
| Median number of previous colonoscopies (range) | 3 (1–9) |
| Adenoma detected at last colonoscopy (%) | 22 (35.5%) |
| Colorectal cancer resection (%)† | 8 (12.9%; 4 right colon) |
*Three, MLH1; four, MSH2; one, MSH6. A further 11 patients had a relative with a mismatch repair gene mutation.
†Patients who had a right hemicolectomy were examined from ileocolonic anastomosis to sigmoid–descending junction. Those who had a left hemicolectomy were examined from caecum to rectum twice.