|
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
|
- L, low risk of bias; U, unclear risk of bias; H, high risk of bias
