Table 6 Risk of bias definition
Abtahi et al. [26] | Abtahi et al. [27] | Tallarico et al. [28] | Zuffetti et al. [29] | Mozzati et al. [8] | López-Cedrún et al. [32] | Griffiths [33] | Abtahi et al. [34] | Shabestari et al. [35] | |
|---|---|---|---|---|---|---|---|---|---|
Random Sequence generation | + | + | − | + | − | − | + | + | − |
Allocation concealment | + | + | + | + | + | + | + | + | + |
Blinding of participants and personnel | + | + | − | − | − | − | − | + | − |
Blinding of outcome data | + | + | − | − | − | − | − | − | − |
Selective reporting | + | + | + | + | + | + | + | + | + |
Other bias | + | + | + | + | + | + | − | + | + |