Table 2 Risk of bias
Bias | Becker et al. [30] | Rubak et al. [31] |
|---|---|---|
Random sequence generation (selection bias) | Low - Selection by central permuted block randomisation | Low - Selection by drawing lots |
Allocation Concealment (selection bias) | Low | Unclear-Insufficient information provided |
Blinding of participants and personnel (performance bias) | High – Blinding of participants and personnel was not possible | High – Blinding of participants and personnel was not possible |
Blinding of outcome assessment (detection bias) | High – Self-reported outcomes | High – Self-reported outcomes |
Incomplete outcome data (attrition bias) | Low – Clear participant flow reported | Low – Clear participant flow reported |
Selective reporting (reporting bias) | Low – The published report includes all expected outcomes | Low – The published report includes all expected outcomes |
Other bias | Unclear – but unlikely. Insufficient information to assess whether another important risk of bias exists | Unclear – but possible; no baseline data. Insufficient information to assess whether another important risk of bias exists |