Table 2 Risk bias assessment of eligible studies
Author | Domains | |||||
|---|---|---|---|---|---|---|
| Â | Sequence generation | Allocation concealment | Blinding | Incomplete outcome data | Selective outcome report | Others sources of bias |
Pettigrew[24] | Yes | Yes | No | Yes | Yes | No* |
Tsang[23] | No | No | No | Yes | Yes | Yes |
Cohn[26] | Unclear | Unclear | No | Yes | Yes | Yes |
Chatwiriya-charoen[[25] | No | No | No | Yes | Yes | Yes |
Lahat[17] | No | No | No | Yes | Yes | Yes |
Duttaroy[7] | Unclear | Yes | No | Yes | Yes | Yes |
Chiang[16] | No | No | No | Yes | Yes | Yes |
Khan[18] | Yes | Unclear | No | Yes | Yes | Yes |