Table 1 Summary of risk of bias assessment of randomized controlled trials
Domain | Low risk | High risk | Unclear |
|---|---|---|---|
Random sequence generation | 46% | < 1% | 53% |
Allocation concealment | 12% | 30% | 58% |
Blinding of patients and personnel | 17% | 31% | 53% |
Blinding of outcome assessment | 23% | 23% | 54% |
Incomplete outcome data | 96% | < 1% | 4% |
Selective reporting | 95% | < 1% | 4% |