Table 2 Evaluation of the risk of bias
Study | Random sequence generation (selection bias) | Allocation concealment (selection bias) | Blinding of participants and researchers (performance bias) | Blinding of outcome assessment (detection bias) | Incomplete outcome data (attrition bias) | Selective reporting (reporting bias) | Other bias |
|---|---|---|---|---|---|---|---|
Hampé-Kautz [8] | Low | Low | Low | Unclear | Low | Low | Low |
Jorquera [9] | Low | Low | Low | Unclear | Low | Low | Low |
Alshiddi [10] | Low | Low | Low | Unclear | Low | Low | Low |
Czigola [11] | Low | Low | Low | Low | Low | Low | Low |
Mahn [12] | Low | Low | Low | Unclear | Low | Low | Low |
Alsaleh [13] | Low | Low | Low | Unclear | Low | Low | Low |
Brandt [14] | Low | Low | Low | Unclear | Low | Low | Low |