Table 2 The risk of biased assessed using Cochrane Risk of bias assessment tool
Cochrane scale | Ogaji, 2021 | Gebremariam, 2020 | Unger, 2019 | Flax, 2022 | Flax, 2014 | Adam, 2021 |
|---|---|---|---|---|---|---|
Random sequence generation (Selection bias) | Yes | ? | Yes | No | Yes | ? |
Allocation concealment (Selection bias) | Yes | Yes | Yes | Yes | Yes | Yes |
Blinding of participants and personnel (Performance bias) | Yes | No | No | Yes | ? | Yes |
Blinding of outcome assessment (Detection bias) | Yes | ? | Yes | No | Yes | ? |
Incomplete outcome data (Attrition bias) | No | Yes | Yes | Yes | Yes | Yes |
Selective reporting (Reporting bias) | Yes | Yes | ? | Yes | ? | Yes |
Other bias | Yes | Yes | ? | ? | ? | ? |