Table 3.

Results of subgroup analysis

Moderator	No of studies	Pooled prevalence	95% CI		I2	P value
			Lower	Upper
Interest population
Pregnant women	6	65.5%	58.1%	72.5%	88%	<0.001
Patients	4	46.5%	26.7%	66.9%	98%	<0.001
Tertiary students	6	44.1%	27.5%	61.3%	99%	<0.001
Geopolitical zone
Coastal belt	17	52.1%	43.5%	60.6%	98%	<0.001
Middle belt	5	62.1%	40.9%	82.0%	98%	<0.001
Northern belt	5	50.6%	26.8%	74.4%	99%	<0.001
Study setting
Rural	5	61.2%	36.5%	84.5%	98%	<0.001
Urban	22	52.0%	44.0%	59.9%	98%	<0.001