Patient demographics and index colonoscopy findings
| Patient demographics | Total index cases N=775 | % |
| Sex, female | 325 | 42 |
| Age in years (median) at index colonoscopy | 65 | (range 60–72) |
| Findings | ||
| Normal colonoscopy (absence of cancer or premalignant polyps) | 245 | 31.6 |
| Cancer detected | 36 | 4.6 |
| Cases of pre-malignant polyp detected (total cases) | 515 | 66.5 |
| Cases of pre-malignant polyp detected in absence of cancer | 493 | 63.6 |
| Tubular adenoma | 448 | 57.8 |
| Tubular villious adenoma | 100 | 12.9 |
| Villious adenoma | 4 | 0.5 |
| Sessile serrated lesion (SSL) | 66 | 8.6 |
| Median number of premalignant polyps (in positive findings) | 2 | (range 1–17) |
| High risk criteria | 228 | 29.4 |
| 5 or more premalignant polyps | 70 | 9.0 |
| Advanced polyps | 178 | 23.0 |
| Adenoma/SSL 10 mm or more | 165 | 21.3 |
| Adenoma with high grade dysplasia | 27 | 3.5 |
| SSL with dysplasia | 7 | 0.9 |
| LNPCP | 55 | 7.1 |
| Procedure | ||
| Grade of bowel preparation | ||
| Excellent | 567 | 73.2 |
| Good | 208 | 26.8 |
| Gloucester Comfort score | ||
| 1—no discomfort | 559 | 72.1 |
| 2—minimal discomfort | 183 | 23.6 |
| 3—mild discomfort | 28 | 3.6 |
| 4—moderate discomfort | 5 | 0.6 |
| 5—severe discomfort | 0 | 0.0 |
| Medication | ||
| Midazolam (mg), median | 3 | (range 0–10) |
| Fentanyl (mg), median | 50 | (range 0–150) |
| Buscopan (mg), median | 0 | (range 0–20) |
LNPCP, large non-pedunculated colonic polyp.