Table 2

Variables to be extracted for moderation analysis (where available, see supplementary material 3 for detailed variable categories and levels)

Source characteristicsSample characteristicsDesign characteristicsIntervention characteristics
Publication statusAgeMethod of recruitmentSize of the effect on sleep
Publication yearGenderNature of comparison group(s)Duration
Journal impact factorType of mental health problem(s)Attrition/dropout rateTheoretical basis
Type of sleep problem(s)Timing of follow-upMode of delivery
Clinical status of mental healthNature of outcome measure(s)Adherence
Clinical status of sleep problemType of analysis
ComorbidityAdjusted versus unadjusted data
Concurrent medication useStudy quality
Concurrent psychological help