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Cochrane Collaboration’s tool for assessing risk of bias
| First author | Selection bias | Performance bias | Detection bias | Attrition bias | Reporting bias | Other bias | |
|---|---|---|---|---|---|---|---|
| Random sequence generation | Allocation concealment | Blinding of participants and personnell | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | ||
| Majumdar [24] | + | − | − | − | + | + | − |
| Morales [22] | + | + | − | − | + | + | + |
| Muslim [25] | + | ? | − | − | + | + | ? |
+ low risk of bias, − high risk of bias, ? unknown risk of bias
