Table 2 The risk-of-bias table in this meta-analysis
Chen CM [25] | Feng Y [26] | Guo ZP [27] | Li J [28] | Ren HL [29] | Wang W [30] | Xiao L [31] | Yuan WQ [32] | Zhai HL [33] | Zhang L [34] | Zhang LG [35] | Zhang X [36] | Zhao XQ [37] | Zhou R [38] | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Random sequence generation | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low |
Allocation concealment | Not | Not | Not | Not | Not | Not | Not | Not | Not | Not | Not | Not | Not | Not |
Blinding of participants and personnel | High | High | High | High | High | High | High | High | High | High | High | High | High | High |
Blinding of outcome assessment | Low | Low | Low | Not | Low | High | Low | High | Low | Low | Low | Low | High | High |
Incomplete outcome data | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low |
Selective reporting | Not | Low | Not | High | Not | High | Low | Low | Low | Low | Low | High | Low | Low |
Other biases | Low | Low | Low | Not | Not | Low | Not | Not | Not | Low | Low | High | Not | Low |