Table 4. Prevalence of DFI in the group of men aged ≥40 y and <40 y in the entire cohort.

Group	DFI (%)
	0–10% n(%)	>10% n(%)
<40 y (n = 248)	115(46.37)	133(53.63)
≥40 y (n = 88)	24(27.27)*	64(72.73)*

DFI – sperm DNA fragmentation index, n – number of subjects. *Significant difference between compared groups at p = 0.0018; chi-squared test