Table 4 Methodological assessment according to six domains of potential biases (Cochrane risk of bias tool)
RCT study = 4 | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other bias |
|---|---|---|---|---|---|---|---|
Elmallah (2016) | Low | Low | High | Low | Low | Low | Unclear |
Song (2018) | Low | Low | High | Low | Low | Low | Unclear |
Wood (2020) | Low | Low | High | Low | Low | Low | Unclear |
Xia (2019) | Low | Low | High | Low | Low | Low | Unclear |