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Clinical characteristics of the enrolled patients n (%)
| Methadone patients | Controls | P value | |
| Number of patients | 56 | 68 | |
| Number of colonoscopies | 67 | 72 | |
| Average age (yr) | 52.2 ± 9.2 | 54.6 ± 15.5 | 0.27 |
| Gender | 0.67 | ||
| Male | 46 (68.7) | 47 (65.3) | |
| Female | 21 (31.3) | 25 (34.7) | |
| Indication | |||
| Bleeding | 22 (32.4) | 47 (40.9) | |
| Anemia | 3 (4.4) | 25 (21.7) | |
| Screening | 31 (45.6) | 11 (9.6) | |
| Abdominal pain | 5 (7.4) | 8 (7) | |
| Other | 7 (10.3) | 24 (20.9) |
