Table 4.
[30] | [31] | [32] | [36] | [39] | ||
---|---|---|---|---|---|---|
Selection | Random sequence generation | + | + | + | - | + |
Allocation concealment | + | + | + | - | - | |
Performance | Blinding of personnel | + | + | + | - | + |
Blinding of participants | + | + | + | - | - | |
Detection | Blinding outcome assessments | + | + | + | + | + |
Attrition | Incomplete outcome data | + | + | + | + | + |
Reporting | Selective reporting | + | + | + | + | + |
Overall risk of bias | Low | Low | Low | Moderate | Low |
+ (Low risk of bias); - (high risk of bias).