. Author manuscript; available in PMC: 2016 Jan 11.

Published in final edited form as: Int J Environ Health Res. 2014 Oct 1;25(4):405–417. doi: 10.1080/09603123.2014.958137

Table 6.

The stepwise multiple regression results for relationships between each semen parameter considered and all metals (Pb, Cd, Zn, Cu and As), alcohol consumption, age, and BMI.^a

Dependent Parameters	Independent parameters	Parameter estimates	Standard errors	P
Concentration	BMI	−0.0648	0.003	<0.001
	Cd, seminal plasma	−0.002	0.016	0.056
Motility	Age	−0.021	0.0044	<0.001
	BMI	−0.011	0.0101	0.295
Viability	Age	−0.004	0.0024	<0.001
	BMI	0.0005	0.005	0.920
	Cd, urine	−0.001	0.001	0.397

Semen quality parameters and metal concentrations were ln-transformed. No data transformation was needed for age and BMI.