| Sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective outcome reporting | Other potential threats | Total |
---|---|---|---|---|---|---|---|---|
Schaller et al., 2010 | Low | Low | Low | Low | Low | Low | Unclear | 6 |
Geldner et al., 2012 | Low | Unclear | Low | Low | Low | Low | Unclear | 5 |
Carron et al., 2013 | Low | Low | Unclear | Unclear | Low | Low | Unclear | 4 |
Koyuncu 2014 | Unclear | Unclear | Low | Low | Low | Low | Unclear | 4 |
Brueckmann et al., 2015 | Low | Low | Low | Low | Low | Low | Low | 7 |
Unal et al., 2015 | Unclear | Low | Unclear | Unclear | Low | Low | Unclear | 3 |
Hakimoglu et al., 2016 | Low | Unclear | Unclear | Unclear | Low | Low | Unclear | 3 |
Loh 2017 | Low | Low | Low | Low | Low | Low | Unclear | 6 |
Yagan et al., 2017 | Low | Low | Low | High | Low | Low | Unclear | 5 |
Alday et al., 2019 | Unclear | Unclear | Low | High | Low | Low | Unclear | 3 |
Claroni et al., 2019 | Low | Low | Low | Low | Low | Low | Unclear | 6 |
Togioka et al., 2020 | Low | Low | High | High | Low | Low | Low | 4 |
Lee et al., 2020 | Low | Low | High | Low | Low | Low | Unclear | 5 |
Ba et al., 2020 | Low | Unclear | Unclear | Unclear | Low | Low | Unclear | 3 |