Table 3. Characteristics of colorectal polyps at index colonoscopy (n = 1662).
| Characteristic | No. of polyps (%) |
| Histology | |
| hyperplastic polyp | 588 (35.4) |
| serrated adenoma | 21 (1.3) |
| tubular adenoma | 707 (42.5) |
| tubulovillous adenoma | 289 (17.4) |
| villous adenoma | 41 (2.4) |
| unspecified* | 16 (1.0) |
| Classification | |
| hyperplastic polyp | 588 (35.4) |
| non-advanced adenoma | 578 (34.8) |
| advanced adenoma | 496 (29.8) |
| Anatomical site | |
| cecum and ascending colon | 292 (17.6) |
| transverse colon | 165 (9.9) |
| descending colon | 184 (11.1) |
| sigmoid colon and rectum | 1021 (61.4) |
| Shape | |
| pedunculated | 313 (18.8) |
| sessile | 1309 (78.8) |
| flat | 40 (2.4) |
| Size (cm) | |
| <0.5 | 694 (41.8) |
| 0.5–0.9 | 657 (39.5) |
| 1.0–1.9 | 243 (14.6) |
| ≥ 2 | 68 (4.1) |
| Degree of dysplasia | |
| mild | 615 (37.0) |
| moderate | 401 (24.1) |
| severe | 40 (2.4) |
| non-invasive carcinoma | 18 (1.1) |
| not applicable† | 588 (35.4) |
*
Other polyps include lymphoid aggregates and hamartoma.
†
Hyperplastic polyps.