| Site | Number (n) | Percent % | Standard deviation (SD) |
| Colon | 36 | 36.0 | 0.482 |
| Caecum | 3 | 3.0 | 0.141 |
| Recto-sigmoid | 20 | 20.0 | 0.394 |
| Rectal | 41 | 41.0 | 0.494 |