| First round % (n = 345) | Second round % (n = 197) | Third round % (n = 124) | |
| Stage A | 49.2 | 40.1 | 36.3 |
| Polyp cancer | 17.8 | 15.2 | 9.7 |
| Stage B | 20.3 | 29.2 | 21.8 |
| Stage C1 | 18.1 | 20.3 | 31.5 |
| Stage C2 | 2.8 | 3.0 | 2.4 |
| Stage D | 7.1 | 2.0 | 0.8 |
| Unstaged | 2.5 | 5.1 | 7.2 |
Stage A includes the polyp cancers. Dukes’ staging definitions: A, confined to bowel wall; B, through bowel wall; C1, paracolic lymph nodes only involved; C2, lymph nodes along named vessels involved; D, distant metastases.