study | confounding | selection of participants | classification of intervention | deviations from intended interventions | missing data | measurement of outcomes | selection of the reported result | overall risk of bias |
---|---|---|---|---|---|---|---|---|
Sakamoto2018 [32] | Serious | Low | Low | Low | Low | Low | Low | Serious |
Hayakawa 2016 [36] | Serious | Low | Low | Low | Low | Moderate | Moderate | Serious |
Tsushima 2014 [37] | Serious | Moderate | Low | Low | Low | Low | Low | Serious |
Kataoka 2015 [38] | Low | Low | Low | Low | Low | Low | Low | Low |