Table 7. Odds ratio (OR) for DFI in the group of men aged ≥40 y compared to men <40 y in the entire cohort.

	< 40 y (n = 248) n(%)	≥ 40 y (n = 88) n(%)	OR (95%CI)
DFI 0–10%	115(46.37)	24(27.27)	0.4337* (0.2549 to 0.7378)
DFI >10%	133(53.63)	64(72.73)	2.3058* (1.3553–3.9228)

DFI – sperm DNA fragmentation index, n – number of subjects. *Statistical significance at p = 0.0021; 95% CI – 95% confidential interval