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Table 2 Methodological quality of included studies

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

Author Year Study typea 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 includedb
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
  1. aRCT, randomized controlled trial; nRCS, non-randomized comparative study
  2. 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