Table 2 Risk of bias assessment included in the meta-analysis
No. | Reference | Selection of participants | Confounding variables | Measurement of exposure | Blinding of outcome assessment | Incomplete outcome date | Selective outcome reporting |
|---|---|---|---|---|---|---|---|
1 | Cacciatore et al. [25] | L | L | L | L | U | L |
2 | Wang et al. [26] | L | L | L | L | U | L |
3 | Li et al. [27] | L | L | H | L | U | L |
4 | Castro-Rodriguez et al. [28] | L | L | L | L | L | L |
5 | Chode et al. [29] | L | H | H | L | L | L |
6 | Liccini et al. [30] | L | L | H | L | H | L |
7 | Chao et al. [31] | L | L | H | L | U | L |
8 | Li et al. [32] | L | L | H | L | L | L |