TABLE 3.

Univariable and multivariable linear regression for association between stimulant exposure and semen parameters

	Univariable		Multivariable*
Semen parameter	Parameter estimate (SE)	p-value	Parameter estimate (SE)	p-value
Volume (ml)	−0.32 (0.16)	0.048	−0.35 (0.16)	0.035
Concentration (mil/ml)	−2.40 (4.11)	0.56	−3.37 (4.15)	0.42
Motility (%)	−0.88 (1.39)	0.53	−1.61 (1.39)	0.25
TMSC (mil/ejaculate)	−14.44 (8.39)	0.085	−18.0 (8.44)	0.033
Morphology (% normal)	1.00 (0.63)	0.11	1.06 (0.63)	0.094

Abbreviations: SE, standard error; TMSC, total motile sperm count.

^*All multivariable models were adjusted for use of non-stimulant medications and age.