Table 3 The cochrane collaboration’s tool for assessing risk of bias in randomized trials.
Study | Randomisation process | Deviations from the intended interventions | Missing outcome data | Measurement of the outcome | Selection of the reported result | Overall |
|---|---|---|---|---|---|---|
Hazebroek et al.13 | ( +) | ( +) | ( +) | ( +) | ( +) | ( +) |
Wojnicz et al.15 | (!) | ( +) | ( +) | (!) | (!) | (!) |
Frustaci et al.16 | ( +) | ( +) | ( +) | ( +) | ( +) | ( +) |
Schultheiss et al.17 | ( +) | ( +) | ( +) | ( +) | ( +) | ( +) |
Parrillo et al.18 | (!) | (!) | (–) | ( +) | (!) | (–) |
Poloczkova et al.14 | (!) | (!) | ( +) | (!) | ( +) | (!) |
Mason et al.19 | (!) | ( +) | ( +) | (!) | (!) | (!) |
( +) Low risk of bias; (–) high risk of bias; (!) some concerns | ||||||
