Table 2. The quality of the included studies.

	Was the sample frame appropriate to address the target population?	Were the study participants sampled in an appropriate way?	Was the sample size adequate?	Were the study subjects and the setting described in detail?	Was the data analysis conducted with sufficient coverage of the identified sample?	Were valid methods used for the identification of the condition?	Was the condition measured in a standard and reliable way for all participants?	Was there appropriate statistical analysis?	Was the response rate adequate, and if not, was the low response rate managed appropriately?	Total score
Dominguez et al. 2006	Yes	Yes	Yes	Yes	Yes	Not clear	Yes	Yes	Not clear	16
Cestari et al. 2006	Yes	Yes	Yes	Yes	Yes	Not clear	Yes	Yes	Not clear	16
Freitag et al. 2008	Yes	Yes	Yes	Not clear	Yes	Not clear	Yes	Yes	Not clear	15
Dogramaci et al. 2009	Yes	Not clear	Yes	Yes	Yes	Not clear	Yes	Yes	Not clear	15
Misery et al. 2010	Yes	Not clear	No	Yes	No	Not clear	Yes	Yes	Not clear	11
Park et al. 2013	Yes	Not clear	No	Yes	No	Not clear	Yes	Yes	Not clear	11
Yalamanchili et al. 2015	Yes	Not clear	Yes	Yes	Yes	Not clear	Yes	Yes	Not clear	15
Ikino et al. 2015	Yes	No	No	Yes	No	Not clear	Yes	Yes	Not clear	10
Harumi et al. 2016	Yes	Not clear	No	Not clear	No	Not clear	Yes	Yes	Not clear	10
Sarkar et al. 2016	Yes	Not clear	Yes	Yes	Yes	Not clear	Yes	Yes	Not clear	15
Kothari et al. 2018	Yes	Not clear	Yes	Yes	Yes	Not clear	Not clear	Yes	Not clear	14
Anderson et al. 2019	Yes	Not clear	No	Yes	No	Not clear	Yes	Yes	Not clear	11
Pollo et al. 2018	Yes	Not clear	Yes	Yes	Yes	Not clear	Yes	Yes	Not clear	15
Jusuf et al. 2019	Yes	Not clear	No	Yes	No	Not clear	Yes	Yes	Not clear	11