Table 3.

Linear regression analyses of temporal trend in semen parameters before and after adjustment for age, body mass index (BMI), and sexual abstinence duration.

Semen parameter	Unadjusted			Adjusted
	β	95% CI	P value	β	95% CI	P value
Sperm concentration	− 2.53	− 2.44 to − 2.62	< 0.001	− 2.36	− 2.28 to − 2.45	< 0.001
Total sperm count	− 7.57	− 7.13 to − 8.00	< 0.001	− 7.30	− 6.87 to − 7.74	< 0.001
Progressive motility	− 1.49	− 1.41 to − 1.56	< 0.001	− 1.32	− 1.25 to − 1.40	< 0.001
Total motility	− 1.24	− 1.17 to − 1.32	< 0.001	− 1.12	− 1.05 to − 1.19	< 0.001

CI confidence interval.