| Cohort by age (no screened) | Normal | Hyperplastic | Tubular adenoma | Tubulovillous adenoma | Colorectal cancer |
| Low risk <50 (18) | 11 (61.1%) | 6 (33.3%) | 1 (5.6%) | 0 (0%) | 0 (0%) |
| Low risk >50 (29) | 11 (37.9%) | 5 (17.3%) | 11 (37.9%) | 2 (6.9%) | 0 (0%) |
| Medium risk <50 (244) | 176 (72.1%) | 28 (11.5%) | 36 (14.7%) | 4 (1.6%) | 0 (0%) |
| Medium risk >50 (243) | 143 (58.8%) | 38 (15.6%) | 47 (19.3%) | 15 (6.2%) | 0 (0%) |
| HNPCC <50 (61) | 41 (67.2%) | 9 (14.8%) | 10 (16.4%) | 0 (0%) | 1 (1.6%) |
| HNPCC >50 (42) | 24 (57.1%) | 2 (4.8%) | 10 (24%) | 4 (9.5%) | 2 (4.8%) |