Impacts of Outdoor Air Pollution on Human Semen Quality: A Meta-Analysis and Systematic Review

Table 2

Primary outcomes of the enrolled studies.

Study	Sample size		Semen volume (mL)		Sperm concentration (10^6/mL)		Total count (10^6)
	High	Low	High	Low	High	Low	High	Low
Selevan, 2000	47	162
De Rosa, 2003	85	85					NM	NM
Rubes, 2005	36	36
Guven, 2008	38	35					NM	NM
Boggia, 2009	100	64	NM	NM			NM	NM
Rubes, 2010	47	47					NM	NM
Calogero, 2011	36	32	NM	NM
Zhou, 2014	429	917					NM	NM
Wu, 2016	367	349	NM	NM
Liu, 2017	370	327	NM	NM
Lao, 2018	535	501	NM	NM			NM	NM
Study	Progressive motility (PR, %)		Total motility (, %)		Normal morphology (%)		SCSA-DFI (%)
	High	Low	High	Low	High	Low	High	Low
Selevan, 2000
De Rosa, 2003					NM	NM	NM	NM
Rubes, 2005	NM	NM
Guven, 2008			NM	NM	NM	NM	NM	NM
Boggia, 2009					NM	NM	NM	NM
Rubes, 2010
Calogero, 2011
Zhou, 2014							NM	NM
Wu, 2016					NM	NM	NM	NM
Liu, 2017					NM	NM	NM	NM
Lao, 2018							NM	NM

NM: not mentioned.