Table 3 Risk of bias assessment
First author, year | Item and score | Total score | |||||||
|---|---|---|---|---|---|---|---|---|---|
Is the case definition adequate? (1) | Represent activeness of the cases (1) | Selection of controls (1) | Definition of controls (1) | Comparability of cases and controls based on the design or analysis (2) | Ascertainment of exposure (1) | The same method of ascertainment for cases and controls (1) | Non-response rate (1) | ||
Maleki, 2020 [24] | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
Safabakhsh, 2020 [48] | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
Sasanfar, 2019 [26] | 1 | 1 | 0 | 0 | 2 | 0 | 1 | 0 | 5 |
Vahid, 2018 [19] | 1 | 1 | 0 | 0 | 2 | 0 | 1 | 0 | 5 |
Heidari, 2018 [49] | 1 | 0 | 0 | 1 | 2 | 0 | 0 | 0 | 4 |
Fararouei, 2018 [22] | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
Dianatinasab, 2017 [21] | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 1 | 8 |
Pourzand, 2016 [50] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Montazeri, 2016 [51] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 1 | 7 |
Salarabadi, 2015 [52] | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 4 |
Arbabi, 2014 [53] | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 4 |
Hosseinzadeh,2014 [54] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Sheikhi, 2014 [25] | 1 | 1 | 0 | 0 | 2 | 1 | 1 | 0 | 6 |
Bahadoran, 2013 [55] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Hajian, 2013 [56] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Hajian, 2012 [57] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Hajian, 2011 [58] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Rezaeiian, 2012 [59] | 1 | 1 | 0 | 1 | 2 | 0 | 0 | 0 | 5 |
Ghiasvand, 2012 [20] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Arbabi Bidgoli, 2011 [60] | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 4 |
Tehranian, 2010 [23] | 1 | 1 | 0 | 1 | 2 | 0 | 0 | 0 | 5 |
Ghosn, 2020 [61] | 1 | 0 | 1 | 1 | 2 | 0 | 0 | 0 | 5 |
Saremi, 2019 [62] | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 5 |
Lotfi, 2008 [63] | 1 | 1 | 1 | 0 | 2 | 0 | 1 | 0 | 6 |