Table 1.
Risk of bias within studies - Parallel trials
| Parallel group trials | ||||||
|---|---|---|---|---|---|---|
|
| ||||||
| Trials | Bias arising from randomization process | Bias due to deviations from intended interventions | Bias due to missing outcome | Bias in the measurement of the outcome | Bias in selection of the reported result | Overall risk of bias judgement |
| Nagarajappa etal., 2015[7] | Some concerns | Low risk of bias | Low risk of bias | Some concerns | Low risk of bias | Some concerns |
| Ashwin etal., 2015[26] | Some concerns | Low risk of bias | Low risk of bias | Some concerns | Low risk of bias | Some concerns |
| Nozari etal., 2021[29] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |
| Kuru etal., 2017[33] | Low risk of bias | Low risk of bias | Low risk of bias | Some concerns | Low risk of bias | Some concerns |
| Bafna etal., 2018[35] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |
| Javid etal., 2019[30] | Some concerns | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Some concerns |
| Taipale etal., 2012[36] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |
| Toiviainen etal., 2014[37] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |
| Jasberg etal., 2017[38] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |
| Alanzi etal., 2018[39] | Some concerns | Low risk of bias | Low risk of bias | Some concerns | Low risk of bias | Some concerns |
| Invernici etal., 2020[40] | Low risk of bias | Low risk of bias | Low risk of bias | Some concerns | Low risk of bias | Some concerns |
| Gueimonde etal., 2016[41] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |
| Ishikawa etal., 2014[42] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |
| Tehrani etal., 2021[43] | Some concerns | Low risk of bias | Low risk of bias | Some concerns | Low risk of bias | Some concerns |
| Jindal etal., 2011[44] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |
| Yousuf etal., 2017[45] | Some concerns | Some concerns | Low risk of bias | Some concerns | Low risk of bias | High risk of bias |