Semen quality pattern and age threshold: a retrospective cross-sectional study of 71,623 infertile men in China, between 2011 and 2017

Table 4 Effects of age on semen parameters

Semen parameter	R²	coefficient	P-value
Semen volume (ml)	0.007	−0.09	< 0.001
Sperm concentration (10⁶/ml)	0.009	0.09	< 0.001
Total sperm count (10⁶)	0	0.02	< 0.001
Sperm progressive motility (PR%)	0.001	−0.03	< 0.001
Total motile spermatozoa [(PR + NP)%]	0.005	−0.07	< 0.001
Immotile spermatozoa (IM%)	0.006	0.08	< 0.001

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