Table 2 Risk of bias assessment by different items using the cochrane’s collaboration tool
Author, Year | Selection bias | Performance bias | Detection bias | Attrition bias | Reporting bias | Total | ||
|---|---|---|---|---|---|---|---|---|
Random sequence generation | Allocation concealment | Score | Category | |||||
Kim, 2014 [15] | Low | High | Low | Low | High | Low | 4 | High |
Ersen, 2018 [14] | Low | Unclear | High | Low | High | Low | 3 | High |
Ugurlar, 2018 [16] | Low | Unclear | High | High | Low | Low | 3 | High |
Umay Atlas, 2018 [13] | Low | Unclear | Low | Low | Low | Low | 5 | Unclear |
Mansiz-Kaplan, 2020 [12] | Low | Low | Low | Low | High | Low | 5 | High |
Asheghan, 2020 [4] | Low | Unclear | High | High | High | Low | 2 | High |
Raissi, 2021 [11] | Low | Unclear | Low | Low | High | Low | 4 | High |
Kesikburun, 2021 [1] | Low | Low | High | High | High | Low | 3 | High |