| Sample | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blind of outcome assessment | Incomplete outcome date | Selective reporting | Other sources of bias | Quality grade |
| F. T. Ji [12] | U | U | L | L | H | L | U | B |
| X. J. Zhao [13] | H | U | L | L | L | L | U | B |
| C. Y. Chen [14] | L | U | L | L | L | L | U | B |
| S. X. Cao [15] | L | U | L | L | L | L | U | B |
| L. .F Chen [16] | U | U | L | L | L | L | U | B |
| Y. X. Zhang [9] | L | L | L | L | L | L | L | A |
| Glass K. [11] | L | U | L | L | L | L | U | B |