Confounding | Selection of participants into the study | Classification of interventions | Deviations from intended interventions | Missing data | Measurement of outcomes | Selection of the reported results | Overall risk of bias | |
---|---|---|---|---|---|---|---|---|
Rupprecht 2014 | Criticala | Low | Low | Low | Low | Moderatef | Low | Critical |
Min Kim 2009 | Lowb | Seriousc | Low | Moderated | Moderatee | Moderateg | Moderateh | Serious |
Panjwani 2016 | No information | Seriousi | No information | No information | No information | No information | No information j | Serious |
Cheng 2014 | No informationk | Critical l | Moderatem | Low | No information | Moderaten | Moderateo | Critical |