Table 3 Quality appraisal for intervention studies
Source | Type of study | Selection bias | Performance bias | Detection bias | Attrition bias | Reporting bias | Â | |
|---|---|---|---|---|---|---|---|---|
1. Random sequence generation | 2. Allocation concealment | 3. Blinding of participants and personnel | 4. Blinding of outcome assessment | 5. Incomplete outcome data | 6. Selective reporting | 7. Other bias | ||
Cryer 2005 [31] | Randomised, open label, parallel-group, multicentre, clinical trial | UR | HR | HR | UR | LR | UR | HR |
Janka 2007 [35] | Parallel-group, open-label, randomized, multinational clinical trial | LR | LR | HR | HR | LR | LR | LR |
Josephkutty 1990 [36] | Randomized double-blind cross-over study | UR | UR | UR | UR | UR | UR | UR |
Schweizer 2009 [43] | Randomized, active-controlled, parallel-group study | UR | UR | UR | UR | LR | UR | HR |