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Table 2 Cochrane Collaboration’s tool for assessing risk of bias

From: The efficacy and safety of combination of PD-1 and CTLA-4 inhibitors: a meta-analysis

Study

Random sequence

generation

Allocation concealment

Blinding of participants and researchers

Blinding of outcome assessment

Incomplete outcome data

Selective reporting

Alliance A091401

×

×

Checkmate 032

×

Checkmate 067

Checkmate 069

Checkmate 214

×

×

Checkmate 227

×

×

NCT02374242

×

×

Checkmate 143

×

×

  1. , low risk of bias; × , high risk of bias