| Initial colonoscopy principal finding (number) | 2nd colonoscopy principal finding (number) |
| Normal (11) | Normal (7), 1 or 2 small adenomas (4) |
| 1 or 2 small adenomas (13) | 1 or 2 small adenomas (6), normal (5) |
| Colitis (1) or Crohns (3) | Colitis (1), Crohns (2; 1 declined) |
| Diverticular disease (9) | Diverticular disease (7), normal (1) |
| Radiation proctitis | Radiation proctitis |
| Angiodysplasia | Normal |