Table 3. Sensitivity analysis of some outcomes with World Health Organization 2010 criteria.

Study		Mean difference	Lower CI	Upper CI	p-value	I2
Progressive motile sperm
	La Vignera et al (2013) [7]	5.07	3.48	6.65	<0.001	99%
	La Vignera et al (2013) [7]	12.61	10.20	15.01	<0.001	92%
	Tsounapi et al (2018) [8]	2.1	0.42	3.78	0.01	81%
	Pooled estimate	5.34	3.87	6.81	<0.001	97%
Sperm concentration
	La Vignera et al (2013) [7]	3.57	2.24	4.89	<0.001	89%
	La Vignera et al (2013) [7]	4.05	2.66	5.45	<0.001	77%
	Tsounapi et al (2018) [8]	−0.33	−2.70	2.05	0.79	0%
	Pooled estimate	3.22	1.96	4.48	<0.001	83%

CI: confidence interval.