Table 2 Evaluation of the quality of studies with Downs and Black checklist
Study | Reporting | External validity | Internal validity | Power | Total | Classification |
|---|---|---|---|---|---|---|
Harr et al. [20] | 3 | 3 | 2 | 0 | 8 | Poor |
Holmich et al. [14] | 6 | 3 | 10 | 1 | 20 | Good |
Weir et al. [16] | 9 | 3 | 7 | 1 | 20 | Good |
Yousefzadeh et al. [17] | 8 | 2 | 10 | 0 | 20 | Good |
Schoberl et al. [15] | 7 | 3 | 10 | 1 | 21 | Good |
Yousefzadeh et al. [19] | 8 | 2 | 10 | 0 | 21 | Good |
Gore et al. [18] | 10 | 2 | 9 | 1 | 22 | Good |
Paajanen et al. [13] | 9 | 3 | 11 | 1 | 25 | Excellent |
Sheen et al. [12] | 10 | 3 | 11 | 1 | 25 | Excellent |
Mazbouh et al. [21] | 6 | 2 | 3 | 0 | 11 | Poor |