Table 2.

The prevalence of erectile dysfunction and estimates of heterogeneity when publications are divided into different subgroups.

Sub-group	Category	No. of studies included	Sample size	Prevalence (95% CI)	p value	I 2
By year of publication	Before 2010	2	264	60.78 (35.3, 86.25)	<0.001	94.3
	2010 and above	11	3,237	73.33 (61.23, 85.44)	<0.001	98.8
Sample size	<300	6	845	74.51 (59.54, 89.5)	<0.001	97
	≥300	7	2,656	68.88 (52.17, 85.58)	<0.001	99.2
Country	Nigeria	2	402	84.92 (64.66, 105.17)	<0.001	93.8
	South Africa	2	749	65.51 (7.9, 123.32)	<0.001	99.8
	Ethiopia	2	671	77.88 (62.59, 93.16)	<0.001	95.3
	Others	7	1,679	67.52 (59.45, 75.59)	<0.001	92.2
Sampling technique	Systematic	3	996	83.63 (71.6, 95.66)	<0.001	97.1
	Simple random	1	70	85.7 (77.5, 93.9)	0.1	0.1
	Consecutive	7	2,136	67.22 (50.2, 84.24)	<0.001	98.5
	Not specified	2	299	60.98 (35.40, 86.55)	<0.001	95.5