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Surgical history.
| Surgical history | Number of patients | Percentage |
|---|---|---|
| Appendectomy | 72 | 23.3 |
| Bowel resections | 70 | 22.6 |
| Small bowel | 23 | 7.4 |
| Small bowel and colon | 26 | 8.4 |
| Colon | 21 | 6.8 |
| Cholecystectomy | 36 | 11.7 |
| Exploratory laparotomy | 36 | 11.7 |
| Anal fistula or abscess | 30 | 9.7 |
| Anal fissure | 8 | 2.6 |
| Haemorrhoids | 9 | 2.9 |
