Table 2 Risk of bias assessment according to the Cochrane collaboration’s risk of bias assessment tool
Study, Year (reference) | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Overall assessment of risk of bias |
|---|---|---|---|---|---|---|---|
1. Partsalaki | Low | Low | Low | Low | Unclear | Low | Low |
2. Bailes | Low | Unclear | Low | Low | Unclear | Low | Unclear |
3. Casazza | Low | Low | Low | High | Unclear | Low | Unclear |
4. Truby | Low | Low | Unclear | Unclear | Unclear | Low | Unclear |
5. Goss | Low | Low | High | Low | Unclear | Low | Unclear |
6. Jensen | Low | Low | Unclear | Low | Unclear | Low | Low |
7. Krebs | Low | High | Low | Low | Unclear | Low | Low |
8. Sondike | Low | Low | High | Low | Unclear | Low | Unclear |
9. Demol | Low | Low | Unclear | Low | Unclear | Low | Low |
10. Ibarra-Reynoso | Low | Unclear | Low | Low | Unclear | Low | Unclear |
11. Yackobovitch-Gavan | Low | Low | Low | Low | Unclear | Low | Low |
12. Kirk | Low | Unclear | Unclear | Low | Unclear | Low | Low |