Table 2. Classification of the studies included by economy level and study setting.

Classification		Number of Studies (n=16)	The total sample size of participants in the study (n=7474)
Continent	Asia	2 (12.50%)	5,017
	Africa	14 (87.50%)	2,457
World Bank country income classification	Low-income	3 (18.75%)	631
	Low-middle-income	10 (62.5%)	1,483
	Upper-middle-income	3 (18.75%)	5,360
Study design	Cohort	2 (12.50%)	5,137
	Cross-sectional	7 (43.75%)	1,794
	Qualitative	7 (43.75%)	543
Setting	Community	8 (56.25%)	6,038
	Hospital	7 (43.75%)	1,436