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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