Co-occurrence of IBS and other diseases, and prevalence of IBS in the population study and the samples analysed
| Not IBS | All IBS | IBS-C | IBS-D | IBS-M | IBS-U | |
| All colonoscopies | 581 | 119 | 22 | 28 | 49 | 20 |
| Excluded due to | ||||||
| IBD | 2 | 4 | 0 | 4 | 0 | 0 |
| Spirochetosis | 11 | 5 | 1 | 1 | 2 | 1 |
| Microscopic colitis | 0 | 3 | 0 | 3 | 0 | 0 |
| Polyps | 167 | 30 | 5 | 7 | 15 | 3 |
| Diverticula | 102 | 19 | 2 | 3 | 10 | 4 |
| Included | ||||||
| Faecal sample | 153 | 32 | 9 | 5 | 12 | 6 |
| Sigmoid sample | 313 | 63 | 16 | 11 | 28 | 8 |
| Both faecal and sigmoid | 149 | 29 | 8 | 4 | 12 | 5 |
IBD, inflammatory bowel disease; IBS, irritable bowel syndrome.