Underwater versus conventional endoscopic mucosal resection for small size non-pedunculated colorectal polyps: a randomized controlled trial

Table 4 Comparative analysis of secondary outcomes

Parameter	CEMR	UEMR	Total	P value
	n = 71	n = 71	n = 142
Median procedure time (IQR, second)	81 (52–113)	72 (53–83)		0.183^a
Adverse event	n = 71	n = 71	n = 142
Bleeding	1	1	2	1.000^b
Perforation	0	0	0	/
	n = 64	n = 66	n = 130
Delayed bleeding	2	0	2	0.240^b
Delayed perforation	0	0	0	/
Unfollowed	4	3	7	0.716^b

CEMR conventional endoscopic mucosal resection, UEMR underwater endoscopic mucosal resection
Bleeding defined as prolonged post-polypectomy bleeding (> 30 s)
Delayed bleeding was defined as the presence of bloody stool and endoscopic hemostasis during 7–14 days’ follow-up
^aWilcoxon rank-sum test
^bTwo-tailed Fisher exact test

ISSN: 1471-230X