Distribution of colonoscopy findings for derivation and validation cohort
| Phase I | Phase II | |||
|---|---|---|---|---|
| Patients who had colonoscopy | Patients included in analysis | Patients who had colonoscopy | Patients included in analysis | |
| n = 621 | n = 541 | n = 1,450 | n = 1,334 | |
| Pathology | n (%) | n (%) | n (%) | n (%) |
| Center location | ||||
| Minnesota | 276 (44%) | 263 (49%) | 886 (61%) | 880 (66%) |
| Louisiana | 168 (27%) | 110 (20%) | 367 (25%) | 258 (19%) |
| Washington | 177 (29%) | 168 (31%) | 197 (14%) | 196 (15%) |
| Total number of polyps per colonoscopy | ||||
| 0 | 387 (62%) | 328 (61%) | 846 (58%) | 781 (59%) |
| 1 | 110 (18%) | 91 (17%) | 321 (22%) | 290 (22%) |
| >1 | 124 (20%) | 122 (23%) | 283 (20%) | 263 (20%) |
| Total number of adenomas per colonoscopy | ||||
| 0 | 505 (81%) | 435 (80%) | 1,120 (77%) | 1,027 (77%) |
| 1 | 81 (13%) | 72 (13%) | 230 (16%) | 213 (16%) |
| >1 | 35 (6%) | 34 (6%) | 100 (7%) | 94 (7%) |
| Total number of right-sided adenomas per colonoscopy | ||||
| 0 | 555 (89%) | 481 (89%) | 1,248 (86%) | 1,146 (86%) |
| 1 | 56 (9%) | 50 (9%) | 159 (11%) | 151 (11%) |
| >1 | 10 (2%) | 10 (2%) | 43 (3%) | 37 (3%) |
| Total number of left-sided adenomas per colonoscopy | ||||
| 0 | 553 (89%) | 477 (88%) | 1,273 (88%) | 1,169 (88%) |
| 1 | 54 (9%) | 51 (9%) | 135 (9%) | 125 (9%) |
| >1 | 14 (2%) | 13 (2%) | 42 (3%) | 40 (3%) |
| Total number of advanced adenomas per colonoscopy | ||||
| 0 | 587 (95%) | 508 (94%) | 1,370 (94%) | 1,258 (94%) |
| 1 | 30 (5%) | 29 (5%) | 63 (4%) | 60 (4%) |
| >1 | 4 (0.6%) | 4 (0.7%) | 17 (1%) | 16 (1%) |
| Total number of hyperplastic polyps per colonoscopy | ||||
| 0 | 500 (81%) | 424 (78%) | 1,200 (83%) | 1,104 (83%) |
| 1 | 68 (11%) | 65 (12%) | 167 (12%) | 152 (11%) |
| >1 | 53 (9%) | 51 (9%) | 83 (6%) | 78 (6%) |