Table 2 Risk of bias of the included studies
Study | A | B | C | D | E | F | G | H | I | J | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|
Abbas et al. [50] | + | + | – | + | ? | + | ? | + | + | ? | 6 |
Amini-Nik et al. [17] | + | + | – | – | ? | ? | ? | + | + | ? | 4 |
de Andrade et al. [41] | + | + | – | – | ? | ? | + | + | + | ? | 5 |
Aryan et al. [45] | + | + | – | – | ? | + | ? | + | + | ? | 5 |
Bliley et al. [38] | + | + | – | – | ? | ? | + | + | + | ? | 5 |
Babakhani et al. [42] | ? | + | – | – | ? | ? | ? | + | + | ? | 3 |
Caliari-Oliveira et al. [28] | ? | + | – | – | ? | ? | + | + | + | ? | 4 |
Chang et al. [39] | ? | + | – | – | ? | ? | ? | + | + | ? | 3 |
Feng et al. [37] | ? | + | – | – | ? | ? | ? | + | + | ? | 3 |
Foubert et al. [36] | ? | + | – | – | ? | ? | + | + | + | ? | 4 |
Foubert et al. [52] | ? | + | – | – | ? | ? | + | + | + | ? | 4 |
Franck et al. [16] | ? | + | – | – | ? | ? | ? | + | + | ? | 3 |
Imam et al. [44] | ? | + | – | – | ? | ? | + | + | + | ? | 4 |
Li et al. [29] | + | + | – | – | ? | ? | ? | + | + | ? | 4 |
Liu et al. [47] | + | + | – | – | ? | + | + | + | + | ? | 6 |
Mahmood et al. [46] | ? | + | – | – | ? | + | ? | + | + | ? | 4 |
Xue et al. [43] | ? | + | – | – | ? | ? | ? | + | + | ? | 3 |
Yang et al.—1 [51] | ? | + | – | – | + | ? | + | + | + | ? | 5 |
Yang et al.—2 [40] | ? | + | – | + | + | ? | + | + | + | ? | 6 |
Zhang et al. [48] | + | + | – | – | ? | ? | ? | + | + | ? | 4 |
Zhou et al.—1 [30] | + | + | – | – | ? | + | + | + | + | ? | 6 |
Zhou et al.—2 [49] | ? | + | – | – | ? | + | ? | + | + | ? | 4 |