Baseline demographics and colonoscopy characteristics
| CC (n=683) | CAC (n=656) | p Value | |
| Age (years, median, IQR) | 60 (55–65) | 60 (55–65) | |
| Male (n, %) | 346 (51) | 339 (50) | |
| Previous abdominal operation (n, %) | 203 (30) | 205 (31) | |
| Diverticulosis (n, %) | 173 (25) | 144 (22) | |
| Ottawa bowel preparation score (mean, SD) | 5.5 (3.7) | 5.8 (3.1) | |
| Sedation (n,%) | |||
| None | 69 (10) | 58 (9) | |
| Midazolam only | 1 (0) | 0 (0) | |
| Fentanyl only | 28 (4) | 25 (4) | |
| Midazolam + fentanyl | 580 (86) | 570 (87) | |
| No of colonoscopies per endoscopist (n, %) | 0.41 | ||
| Endoscopist 1 | 343 (50) | 311 (47) | |
| Endoscopist 2 | 152 (22) | 146 (22) | |
| Endoscopist 3 | 83 (12) | 97 (15) | |
| Endoscopist 4 | 68 (10) | 74 (11) | |
| Endoscopist 5 | 29 (4) | 25 (4) | |
| Other endoscopists | 8 (1) | 3 (1) | |
| Colonoscope, 170° field of view (n, %) | 504 (77) | 477 (76) | 0.71 |
| Colonoscope, high definition (n, %) | 541 (82) | 521 (83) | 0.82 |
| Caecal intubation rate (n, %) | 671 (98) | 649 (99) | 0.29 |
| Caecal intubation time (min, mean, SD) | 8.9 (6.2) | 7.7 (5.0) | <0.001 |
| Net withdrawal time (min, median, IQR) | 10 (8–14) | 10 (8–15) | 0.64 |
CAC, cap-assisted colonoscopy; CC, conventional colonoscopy.