Table 4.
The correlations between the sperm DNA fragmentation index and the clinical parameters.
| Variable | ρ | P values |
|---|---|---|
| Age (years old) | 0.09448 | 0.49678 |
| Duration of infertility (months) | 0.15084 | 0.27626 |
| Serum LH (mIU/mL) | 0.09629 | 0.48855 |
| Serum FSH (mIU/mL) | 0.27100 | 0.04747∗ |
| Serum total testosterone (ng/mL) | 0.07281 | 0.60082 |
| Serum free testosterone (pg/mL) | 0.05565 | 0.69519 |
| Brinkman index# | 0.10040 | 0.47442 |
| Body mass index (kg/m2) | 0.17027 | 0.21835 |
| Conventional semen analysis | ||
| Abstinence (days) | −0.12276 | 0.37651 |
| Semen volume (mL) | −0.10769 | 0.43829 |
| Normal sperm morphology (%) | −0.43883 | 0.00090∗ |
| Sperm count (106/mL) | −0.25931 | 0.05829 |
| Total sperm count (106) | −0.30078 | 0.02710 |
| Sperm progressive motility (%) | −0.55996 | 0.00001∗ |
| Motile sperm count (106/mL) | −0.49420 | 0.00015∗ |
| Total motile sperm count (106) | −0.48962 | 0.00017∗ |
| Computer-assisted semen analysis | ||
| Linear velocity (μm/sec) | −0.01841 | 0.89488 |
| Curvilinear velocity (μm/sec) | −0.26853 | 0.04960∗ |
| Linearity | 0.31185 | 0.02170∗ |
| Amplitude of lateral head displacement (μm) |
−0.33075 | 0.01457∗ |
| Beat/cross frequency (Hz) | −0.14489 | 0.29587 |
| High-magnification microscopy | ||
| Proportion of vacuolated sperm (%) | 0.25746 | 0.06538 |
LH: luteinizing hormone; ρ: Spearman's rank correlation coefficient; FSH: follicle-stimulating hormone; *statistically significant; #daily number of cigarettes × years.