Secondary endpoints
| HSP group (346 polyps) | CSP group (341 polyps) | Two-sided p value‡ | ||
| Additional removal for residual lesions | Yes | 7 (2.0 %) | 3 (0.9 %) | 0.211 |
| Snare | 3 (0.9 %) | 2 (0.6 %) | ||
| Biopsy forceps | 4 (1.2 %) | 1 (0.3 %) | ||
| Number of times for additional removal | 1 | 3 (0.9 %) | 1 (0.3 %) | 0.263 |
| 2 | 4 (1.2 %) | 2 (0.6 %) | ||
| Difficulty of CSP | Difficult to resect* | – | 18 (5.3 %) | – |
| Impossible to resect† | – | 3 (0.9 %) | ||
| Easy | – | 320 (93.8 %) | ||
| Median procedure time (s) | 83 | 60 | <0.001 | |
| With submucosal injection | 116 | – | ||
| Without submucosal injection | 65 | – | ||
*≥5 s to resect, after the polyp was tightened up.
†Use of high-frequency electric current.
‡χ2 test for additional removal for residual lesions; between-group differences for number of times for additional removal were evaluated using the Mantel trend test, with the Wilcoxon rank sum test used to evaluate procedure time.
HSP, hot snare polypectomy; CSP, cold snare polypectomy.