Table 1.

CASP quality assessment of the reviewed case–control papers [19].

Authors, Year	Section A: Are the Results of the Trial Valid?						Section B: What are the Results?			Section C: Will the Results Help Locally?
	Item 1	Item 2	Item 3	Item 4	Item 5	Item 6	Item 7	Item 8	Item 9	Item 10	Item 11	Total Quality Score (0–11)
Akcali A., 2014 [25]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9
Akcali A., 2015 [26]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9
Akcali A., 2017 [28]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9
Dursun E., 2011 [23]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9
Ozcaka O., 2012 [24]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9
Ozcaka O., 2013 [18]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9
Porwall S. 2014 [16]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9
Rahimnejad M., 2015 [27]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9
Saglam E., 2017 [29]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	9

Abbreviation: CASP, Critical Appraisal Skills Program. Item 1: Study issue is clearly focused; Item 2: Cohort is recruited in an acceptable way; Item 3: Exposure is accurately measured; Item 4: Outcome is accurately measured; Item 5: Confounding factors are addressed; Item 6: Follow-up is long and complete; Item 7: Results are clear; Item 8: Results are precise; Item 9: Results are credible; Item 10: Results can be applied to the local population; Item 11: Results fit with available evidence.