Table 5.

Cross Sectional Critical Appraisal

	Chang WL. 2012 [67]	Malliaropoulos N. 2015 [64]	Marti B. 1988 [68]	Woolf S. 2002 [63]	Teixeira RN. 2016 [65]	Besomi M., 2019 [66]
Were the criteria for inclusion in the sample clearly defined?	Yes	Yes	No	No	Yes	Yes
Were the study subjects and the setting described in detail?	Yes	Yes	Yes	Yes	Yes	Yes
Was the exposure measured in a valid and reliable way?	Yes	Yes	Yes	Yes	Yes	Yes
Were objective, standard criteria used for measurement of the condition?	No	Yes	Yes	Yes	Yes	Yes
Were confounding factors identified?	Unclear	Yes	Yes	Yes	Yes	Yes
Were strategies to deal with confounding factors stated?	Unclear	Yes	Yes	Unclear	Yes	Yes
Were the outcomes measured in a valid and reliable way?	Unclear	Yes	Yes	Unclear	Yes	Yes
Was appropriate statistical analysis used?	Yes	Yes	Yes	Yes	Yes	Yes