Table 2 Risk of bias assessment using cochrane risk-of-bias tool for randomized trials (RoB 2)
Study | Randomization process | Deviations from intended interventions | Missing outcome data | Measurement of the outcome | Selection of the reported result | Overall bias |
|---|---|---|---|---|---|---|
Boer et al. 2014 [27] | Low | Some concerns | Low | Low | Some concerns | Some concerns |
Lee et al. 2019 [31] | Low | Low | High | Low | Some concerns | High |
Schranz et al. 2018 [33] | Low | High | High | Low | Some concerns | High |
Soori et al. 2020 [35] | Low | High | High | Low | Some concerns | High |
Messler et al. 2018 [32] | Some concerns | Some concerns | Low | Low | Some concerns | Some concerns |