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Comparisons of bowel visualization, preparation assessment, and rate of repeat colonoscopy between methadone and control patients n (%)
| Variables | Methadone patients (n = 67) | Control (n = 72) | P value |
| Bowel visualization | < 0.001 | ||
| Excellent | 12 (17.9) | 30 (41.7) | |
| Good | 14 (20.9) | 28 (38.9) | |
| Fair | 14 (20.9) | 9 (12.5) | |
| Poor | 27 (40.3) | 5 (6.9) | |
| Bowel preparation assessment | < 0.001 | ||
| Good | 22 (32.8) | 52 (72.2) | |
| Fair | 21 (31.3) | 13 (18.1) | |
| Poor | 24 (35.8) | 7 (9.7) | |
| Repeat colonoscopy | 22 (32.8) | 9 (12.5) | 0.004 |
