| Lactose intolerant | Lactose tolerant | Total | |
| Crohn’s disease small bowel | 9 | 2 | 11 |
| Crohn’s disease small and large bowel | 8 | 7 | 15 |
| Crohn’s disease large bowel | 2 | 16 | 18 |
| Ulcerative colitis pancolitis | 6 | 13 | 19 |
| Ulcerative colitis left-sided | 6 | 19 | 25 |
| Ulcerative colitis proctitis | 1 | 5 | 6 |
| Healthy volunteers | 3 | 17 | 20 |