Table 2 Risk of bias from included studies using ROBINS-1 criteria
Study | Bias of confounding variables | bias in selection of participant into study | Bias in classification from intended intervention | Bias due to deviation from intended intervention | Bias due to missing data | Bias in measurement of outcomes | Bias in selection of reporting results |
|---|---|---|---|---|---|---|---|
Raj A. | Low | High | Low | Low | High | Low | High |
Brassard P. | High | Low | Low | Low | Low | Low | Low |
Ekbom A. | High | Low | Low | Low | High | Low | Low |
Kang E. | High | Low | Low | Low | High | High | High |