Open Access
Table I
Risk of bias summary: authors' assessment of each risk of bias item (Selection, Compatibility and Exposure), for each included study according to Newcastle-Ottawa scale.
| Articles | Newcastle-Ottawa Scale | ||
|---|---|---|---|
|
|
|||
| Selection (****) | Comparability (**) | Exposure (***) | |
| Akpinar et al. (2016) | **** | ** | *** |
| Bista et al. (2018) | **** | ** | *** |
| Butchibabu et al. (2014) | *** | *** | |
| Calisir and Ege (2019) | **** | ** | *** |
| Haytac and Ozcelik (2006) | *** | *** | |
| Júnior et al. (2013) | *** | *** | |
| Kara (2008) | **** | * | *** |
| Patel et al. (2020) | *** | *** | |
| Stojanovska et al. (2017) | *** | *** | |
| Uraz et al. (2018) | *** | *** | |
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