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Table 1 Risk of bias items for each included randomized control trial study

From: A systematic review of the effect of sleep interventions on presenteeism

  Random sequence generation Allocation concealment Blinding of participants and personnel Blinding of outcome assessment Incomplete outcome data Selective outcome reporting Other sources of bias
Bostock et al. [16] + + ? + ? ? +
Behrendt et al. [29] + + + ?
Wolever et al. [30] ? ? ? ? + ? +
Morgan et al. [31] ? + + + ? +
  1. Low risk of bias is “+”. High risk of bias is “-”. Unclear risk of bias is “?”