Table 2.

Subgroup analysis of the prevalence of anemia by risk of bias, sex, urban/rural setting, and enrolment date of study using chi² test for heterogeneity

	Prevalence	95% CI	P value	I2 (%)
Risk of bias
High risk	0.13	0.00, 0.25	0.01	99.0
Moderate risk	0.28	0.22, 0.34	0.00	95.0
Low risk	0.23	0.15, 0.32	0.01	98.0
Sex
Male	0.27	0.20, 0.34	0.01	97.0
Female	0.24	0.18, 0.30	0.01	97.0
Enrolment date of study
2003–2011	0.19	0.09, 0.30	0.01	99.0
2012–2016	0.27	0.20, 0.33	0.01	95.0
Rural/urban setting
Rural	0.33	0.26, 0.40	0.00	78.0
Urban	0.24	0.10, 0.37	0.03	98.0