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Table 3 Cochrane summary assessment of risk of bias for included RCTs

From: Internal jugular vein versus subclavian vein as the percutaneous insertion site for totally implantable venous access devices: a meta-analysis of comparative studies

Study Sequence generation Allocation concealment Blinding Incomplete outcome data Selective outcome reporting Other sources of bias Risk of biasa
Biffi, 2009 yes yes yes yes yes no low
Ribeiro, 2012 yes uncertain yes yes yes yes low
Miao, 2014 uncertain uncertain yes yes yes no moderate
  1. aFive or six domains with “yes” represents low risk of bias; three or four domains with “yes” represents moderate risk of bias; two or fewer domains with “yes” represents high risk of bias