Table 2.
Polyp characteristics at baseline colonoscopy.
| Hyperplastic polyp | Sessile serrated lesion | Traditional serrated adenoma | Tubular adenoma | Tubulovillous adenoma | Villous adenoma | |
|---|---|---|---|---|---|---|
| 82,925 (14.9) | 33,468 (6.0) | 2466 (0.4) | 360,438 (64.6) | 74,834 (13.4) | 3906 (0.7) | |
| Size, n (%) | ||||||
| <10 mm | 47,393 (8.5) | 15,985 (2.9) | 620 (0.1) | 181,616 (32.5) | 15,265 (2.7) | 350 (0.1) |
| ≥10 mm | 3727 (0.7) | 5962 (1.1) | 1070 (0.2) | 45,076 (8.1) | 39,506 (7.1) | 2289 (0.4) |
| Undefined | 31,805 (5.7) | 11,521 (2.1) | 776 (0.1) | 133,746 (24.0) | 20,063 (3.6) | 1267 (0.2) |
| Location of polyps, n (%) | ||||||
| Proximal | 20,610 (3.7) | 21,498 (3.9) | 511 (0.1) | 164,520 (29.5) | 15,723 (2.8) | 676 (0.1) |
| Distal | 32,679 (5.9) | 7073 (1.3) | 1052 (0.2) | 130,949 (23.5) | 35,460 (6.4) | 1675 (0.3) |
| Rectum | 18,551 (3.3) | 1790 (0.3) | 468 (0.1) | 23,171 (4.2) | 9600 (1.7) | 574 (0.1) |
| Undefined | 11,085 (2.0) | 3107 (0.6) | 435 (0.1) | 41,798 (7.4) | 14,051 (2.5) | 981 (0.2) |
| Histologic dysplasia, n (%) | ||||||
| LGD | 0 | 3817 (0.7) | 1964 (0.4) | 355,099 (63.6) | 68,429 (12.3) | 3347 (0.6) |
| HGD | 0 | 127 (0.0) | 4332 (0.8) | 5916 (1.1) | 524 (0.1) |
LGD low-grade dysplasia, HGD high-grade dysplasia.