Underwater vs conventional endoscopic mucosal resection in treatment of colorectal polyps: A meta-analysis

Table 1 Basic characteristics of the enrolled studies

Ref.	No. Case	Age	Mean size (mm)	En bloc	Procedure time (min)	Adverse events	Recurrence rate in 3-6 mo	Recurrence rate in 12 mo	Score/Quality assessment	Paper type
	Underwater endoscopic mucosal resection/conventional endoscopic mucosal resection
Rodríguez Sánchez et al[11]	50/112	66.25 ± 10.53	20.78/30.38	31/55	26.14/9.82	1/6	(1/19)/(14/78)	(0/6)/(2/33)	17	Case-control trial
Cadoni et al[10]	195/186	64.7/65.2	Not reported	171/157	No reported	16/23	Not reported	(0/18)/(3/22)	15	Case-control trial
Schenck et al[15]	73/62	62.8/62.3	25.4/21.9	72/54	Not reported	3/0	Not reported	(4/55)/(13/46)	15	Case-control trial
Yamashina et al[16]	104/100	70/68	14/13.5	96/76	2.75/2.92	3/2	Not reported	Not reported	B	RCT
Kim et al[17]	36/44	68.3/69.2	18.5/16.9	32/14	Not reported	0/2	(2/20)/(13/33)	Not reported	13	Case-control trial
Cai et al[18]	53/67	Not reported	Not reported	43/40	Not reported	0/0	(1/56)/(2/67)	Not reported	17	Case-control trial
Chien et al[19]	179/171	63.4/65.4	15.8/18.0	154/141	10.2/9.7	36/15	Not reported	Not reported	16	Case-control trial
Huang et al[20]	32/47	66.54/61.47	14.2/16.4	21/46	7.34/17.82	0/1	Not reported	(2/17)/(0/24)	15	Case-control trial

RCT: Randomized controlled trial.