| Included studies | Random sequence generation | Allocation concealment | Blinding of participants | Blinding of outcome assessment | Incomplete outcome data | Other bias | Quality grade |
| Chen, B. [5] | low | unclear | unclear | low | low | low | B |
| Zhang, M. [6] | unclear | unclear | unclear | low | low | low | B |
| Zhou, Y. [7] | low | unclear | unclear | unclear | low | low | B |
| Rabinstein [8] | low | low | high | low | high | low | B |
| Hao, R. N. [9] | low | unclear |
| unclear | low | low | B |
| Li, L. [10] | low | unclear | unclear | unclear | low | low | B |
| Li, Q. [11] | unclear | unclear | unclear | unclear | low | low | B |
| Lun, X. P. [12] | low | unclear | unclear | unclear | low | low | B |
| Ren, Y. C. [13] | low | unclear | unclear | unclear | low | low | B |
| Wang, M. [14] | unclear | unclear | unclear | unclear | low | low | B |
| Wang, Y. P. [15] | unclear | unclear | high | unclear | low | low | B |
| Wang, Z. Y. [16] | low | unclear | unclear | unclear | low | low | B |
| Wu, T. T. [17] | unclear | unclear | unclear | unclear | low | low | B |
| Xie, F. M. [18] | low | unclear | unclear | unclear | low | low | B |
| Yin, R. H. [19] | unclear | unclear | unclear | unclear | low | low | B |
| Zhang, J. W. [20] | low | unclear | unclear | unclear | low | low | B |
| Zhu, W. Y. [21] | low | unclear | unclear | unclear | low | low | B |
| Zou, X. M. [22] | low | unclear | unclear | unclear | low | low | B |
| Xia, R. [23] | unclear | unclear | unclear | unclear | low | low | B |
| Zhang, J. [24] | low | unclear | unclear | unclear | low | low | B |
| Lin, L. Z. [25] | low | unclear | unclear | unclear | low | low | B |
| Wang, J. M. [26] | unclear | unclear | high | unclear | low | low | B |
| Zhu, B. Z. [27] | low | unclear | high | unclear | low | low | B |
| Jin, L. [28] | low | unclear | unclear | unclear | low | low | B |