Risk of bias summary: review authors' judgements about each risk of bias item for each included study

First author [ref.]Methodological quality assessment: randomised controlled trials
Random sequence generation (selection bias)Allocation of treatment concealedBlinding of participants and personnelBlinding of outcome assessmentIncomplete outcome dataSelective reportingOther biases (e.g. commercial funding)
Calhoun [13]UULUUHH
Honkoop [16]LLHHLLH
Powell [26]LLLLLLU
Shaw [25]LLLULLL
Smith [24]UUUULLH
  • L: low risk of bias; H: high risk of bias; U: unclear risk of bias.