Table 2. Risk of bias judgment for included studies
First author’s name, year | D1 | D2 | D3 | D4 | D5 | D6 | D7 |
|---|---|---|---|---|---|---|---|
Abd El Hamid 2012 [21] | Unclear | Unclear | High | Unclear | Low | Unclear | Unclear |
Akbarzadeh 2014 [34] | Low | Unclear | High | Unclear | Low | High | Unclear |
Alimoradi 2020 [35] | Low | Low | High | Low | Low | Low | Low |
Ashtarkan 2021 [40] | Low | Unclear | Low | Unclear | Low | Low | Low |
Calik 2014 [22] | Low | Low | High | High | High | Unclear | Unclear |
Çelik 2019 [24] | High | Unclear | Low | High | Low | Unclear | Unclear |
Chung 2003 [39] | Low | Low | Unclear | Unclear | Low | Unclear | Low |
Dabiri 2014 [37] | Low | Low | High | Low | Low | Unclear | Unclear |
Gönenç 2020 [55] | Low | Unclear | High | High | Unclear | Unclear | Low |
Hajighasemali 2015 [36] | Low | Unclear | High | Unclear | Unclear | High | Unclear |
Hamidzadeh 2012 [25] | Low | Unclear | High | Low | Low | Unclear | Unclear |
Hamlaci 2017 [23] | Low | Low | High | High | Low | Unclear | Low |
Heidari 2008 [26] | Unclear | Unclear | Low | Low | High | Unclear | Unclear |
Hjelmstedt 2010 [38] | Low | Low | Unclear | Low | Low | Unclear | High |
Hossein Pour 2012 [42] | Low | Unclear | High | Unclear | Low | Unclear | Unclear |
Kashanian 2009 [27] | Low | Low | Unclear | Low | Unclear | Unclear | Low |
Kaviani 2012 [41] | Low | Unclear | High | Unclear | Unclear | Unclear | Unclear |
Kordi 2009 [44] | Low | Unclear | High | High | Unclear | Unclear | Unclear |
Kordi 2011 [46] | Low | Unclear | High | Unclear | Unclear | Unclear | Unclear |
Lee 2004 [2] | Low | Unclear | Low | Low | Unclear | Unclear | Low |
Mady 2024 [28] | High | Unclear | Unclear | Unclear | Low | Unclear | Unclear |
Mafetoni 1 2016 [43] | Low | Unclear | Low | Low | Unclear | Unclear | Unclear |
Mafetoni 2 2016 [45] | Unclear | Low | Low | Low | High | Unclear | Low |
Mammadov 2024 [47] | Low | Unclear | High | Unclear | Low | Low | Low |
Mansouri 2018 [48] | Unclear | Low | High | Low | Low | Unclear | Low |
Mirzaee 2021 [49] | Low | Unclear | Low | High | Low | Low | Unclear |
Moradi 2012 [50] | Low | Unclear | High | High | Low | Unclear | Unclear |
Norhapifah 2024 [32] | Low | Unclear | High | Unclear | Low | Low | Unclear |
Ozgoli 2016 [51] | Low | High | High | High | Low | Unclear | Low |
Salehian 2011 [52] | Low | Low | High | Unclear | Low | Unclear | Unclear |
Samadi 2010 [53] | Unclear | Unclear | High | High | Low | Unclear | Unclear |
Sebastian 2014 [33] | Low | Unclear | High | Unclear | Unclear | Low | Unclear |
Sehhatie-Shafaie 2013 [31] | Low | Unclear | Low | Unclear | Unclear | Low | Low |
Sayyedzadeh Aghdam 2012 [30] | Unclear | Unclear | Low | High | Unclear | Unclear | Unclear |
Torkiyan 2021 [56] | Low | Low | High | Unclear | Low | High | Low |
Türkmen 2019 [29] | Low | Low | Low | High | Low | Unclear | Low |
Wan 2018 [54] | Unclear | Unclear | High | Low | Unclear | Unclear | Unclear |