Minilaparoscopic versus single incision cholecystectomy for the treatment of cholecystolithiasis: a meta-analysis and systematic review

Table 2 Methodological quality of included studies

Author	Year	Study type^a	Random sequence generation	Allocation concealment (selection bias)	Blinding of participants and personnel (performance bias)	Blinding of outcome assessment (detection bias)	Incomplete outcome data (attrition bias)	Selective reporting (reporting bias)	NOS score	Quality of studies included^b
Dabbagh	2015	RCT	Low risk	Low risk	High risk	Low risk	Low risk	High risk	-	High quality
Hu	2013	RCT	High risk	High risk	High risk	High risk	Low risk	High risk	-	Low quality
Lee	2010	RCT	Low risk	Low risk	High risk	Low risk	Low risk	High risk	-	High quality
Saad	2013	RCT	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	-	High quality
Chenkan	2013	nRCS	-	-	-	-	-	-	7	High quality
Hosogi	2011	nRCS	-	-	-	-	-	-	5	Low quality

^aRCT, randomized controlled trial; nRCS, non-randomized comparative study
^bAccording to the Cochrane Collaboration’s tool, the quality of RCT was considered high for more than 3 risk factors were low; according to the Newcastle-Ottawa Scale (NOS), the quality of nRCS was considered high for the score > = 6

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