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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