Pathological features of the evaluated lesions
| Histopathology | PCC | Control group | p Value |
| Adenoma, n (ml/p, min–max) | 470 (0.95, 0–10) | 338 (0.66, 0–9) | <0.001 |
| Flat adenoma, n (ml/p, min–max) | 280 (0.56, 0–5) | 144 (0.28, 0–5) | <0.001 |
| Advanced neoplasia, n (ml/p, min–max) | 103 (0.21, 0–4) | 81 (0.16, 0–5) | 0.067 |
| Carcinoma (n) | 12 | 12 | |
| Serrated lesion, n (ml/p, min–max) | 592 (1.19, 0–12) | 253 (0.49, 0–9) | <0.001 |
| Others (n) | 1 | 3 | |
| Total, n (ml/p, min–max) | 1075 (2.17, 0–14) | 606 (1.18, 0–10) | <0.001 |
Differences in numbers of lesions (ml/p) were compared using Mann–Whitney U test.
Definition of advanced neoplasia: adenoma ≥1 cm, adenoma with high-grade intraepithelial neoplasia, carcinoma.
PCC, pancolonic chromoendoscopy; ml/p: mean lesions per patient±SD.