Table 1.
Baseline characteristics of databases I and II
| Variable | Database I | Database II | Total | ||
|---|---|---|---|---|---|
| Training | Validation | Test‐set I | Test‐set II (WEISS database) | ||
| Total number of patients | 107 | 14 | 78 | 31 | 230 |
| Total number of polyps | 197 | 32 | 157 | 65 | 451 |
| Histology | |||||
| Adenoma | |||||
| Tubular HGD | 1 | 0 | 0 | 3 | 4 |
| Tubular LGD | 124 | 16 | 91 | 34 | 265 |
| Tubulovillous LGD | 5 | 3 | 4 | 2 | 14 |
| Total | 130 | 19 | 95 | 39 | 283 |
| Nonadenoma | |||||
| Hyperplastic | 21 | 2 | 35 | 16 | 74 |
| SSL with dysplasia | 1 | 1 | 1 | 0 | 3 |
| SSL without dysplasia | 44 | 10 | 26 | 10 | 90 |
| Traditional serrated adenoma | 1 | 0 | 0 | 0 | 1 |
| Total | 67 | 13 | 62 | 26 | 168 |
| Location | |||||
| Cecum | 24 | 8 | 18 | 13 | 63 |
| Ascending colon/hepatic | 59 | 5 | 56 | 13 | 133 |
| Transverse | 38 | 4 | 21 | 12 | 75 |
| Descending colon/splenic | 28 | 5 | 25 | 9 | 67 |
| Rectosigmoid | 48 | 10 | 37 | 18 | 113 |
| Morphology | |||||
| Ip | 5 | 1 | 5 | 1 | 12 |
| Is and Isp | 106 | 15 | 76 | 26 | 223 |
| IIa | 81 | 16 | 71 | 36 | 204 |
| IIa and IIc | 0 | 0 | 1 | 0 | 1 |
| IIb | 1 | 0 | 1 | 2 | 4 |
| LST‐NG | 3 | 0 | 0 | 0 | 3 |
| LST‐G | 1 | 0 | 3 | 0 | 4 |
| Size | |||||
| ≤5 mm | 100 | 13 | 111 | 41 | 265 |
| >5 mm or ≤10 mm | 69 | 12 | 37 | 13 | 131 |
| >10 mm | 28 | 7 | 9 | 11 | 55 |
G, granular; HGD, high‐grade dysplasia; LGD, low‐grade dysplasia; LST, lateral spreading tumor; NG, nongranular; SSL, sessile serrated lesion; WEISS, Wellcome/EPSRC Centre for Interventional and Surgical Sciences.