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]