Effect of precut sphincterotomy on post-endoscopic retrograde cholangiopancreatography pancreatitis: A systematic review and meta-analysis

Table 1 Quality analysis of included randomized trials

Study	Year	Center	Country	Type of RCT	Allocation concealment	Intention to-treat	Jadad score
Cennamo et al[13]	2009	Single	Italy	Non blinded	A	Yes	3
Tang et al[15]	2005	Single	Canada	Non blinded	A	Yes	3
Khatibian et al[14]	2008	Single	Iran	Non blinded	B	Yes	3
de Weerth et al[12]	2006	Single	Germany	Non blinded	B	Yes	3
Zhou et al[11]	2006	Single	China	Non blinded	B	N/A	2
Manes et al[10]	2009	Multi	Italy	Non blinded	A	Yes	3
Swan et al[16]	2013	Single	Australia	Non blinded	A	N/A	2

Allocation concealment: A: Adequate; B: Unclear; N/A: Data not available; RCT: Randomized controlled trail.