Random-sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other bias | |
---|---|---|---|---|---|---|---|
Putensen et al. [13] | ? | ? | – | ? | + | ? | – |
Varpula et al. [10] | ? | + | – | ? | + | ? | ? |
Li et al. [12] | ? | ? | – | ? | + | ? | ? |
Zhou et al. [11] | + | + | – | ? | + | + | + |
Hirshberg et al. [16] | + | + | – | ? | + | + | + |