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Table 2 Risk of bias items for each included non-randomized control trial study

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

  Bias due to confounding Bias in the selection of participants for the study Bias in classification of interventions Bias due to deviations from intended intervention Bias due to missing data Bias in measurement of outcomes Bias in the selection of the reported results Overall
Espie et al. [11] Serious Low Low Serious Critical Critical Serious Critical
Burton et al. [17] Serious Low Low Serious Critical Critical Serious Critical
Mills et al. [32] Serious Low Low Serious Moderate Moderate Serious Serious