Risk of bias
| Study | Type of bias; risk | |||
|---|---|---|---|---|
| Sequence generation | Allocation concealment | Incomplete outcome data | Blinding | |
| Ahmed et al. (22) | Unclear | High | High | High |
| Khan et al. (21) | Unclear | High | High | High |
| Bali et al. (20) | High | High | High | High |
| Tokac et al. (19) | Unclear | Low | High | High |
| Arslan et al. (18) | Unclear | Low | High | High |
| Bessa (17) | Low | Low | Unclear | Low |
| Ates et al. (16) | Unclear | Low | High | High |
| Can et al. (15) | Unclear | Low | High | High |
| Ersoy et al. (14) | High | High | High | High |
| Pooled data | Low 1 | Low 5 | Low 0 | Low 1 |