Table 3 Quality assessment of included trials
Study ID | Adequate sequence generation | Allocation concealment | Incomplete outcome data | Blinding | Other source of bias | Selective outcome reporting |
|---|---|---|---|---|---|---|
Xian et al. [6] | Yes | Yes | No | Yes | Unclear | No |
Feng et al. [7] | Yes | Yes | Yes | Yes | Unclear | No |
Zhang et al. [8] | Unclear | Unclear | No | Unclear | Unclear | No |
Wang et al. [9] | Unclear | Unclear | No | Unclear | Unclear | Yes |
Wang et al. [10] | Unclear | Unclear | No | Unclear | Unclear | No |
Nan et al. [11] | Unclear | Unclear | No | Unclear | Unclear | No |
Li et al. [12] | Unclear | Unclear | Yes | Unclear | Unclear | No |
Du et al. [13] | Unclear | Unclear | Yes | Unclear | Unclear | Yes |
Ma [14] | Yes | Unclear | Yes | Unclear | Unclear | No |
Chen [15] | Unclear | Unclear | No | Unclear | Unclear | No |
Zhai et al. [16] | Unclear | Unclear | No | Unclear | Unclear | No |
Zhang et al. [17] | Unclear | Unclear | No | Unclear | Unclear | No |
Zhang et al. [18] | Unclear | Unclear | Yes | Unclear | Unclear | No |
Xia et al. [19] | Unclear | Unclear | No | Unclear | Unclear | No |
Xiang [20] | Unclear | Unclear | No | Unclear | Unclear | No |