Table 3 The multivariate regression analysis of the variables correlated with sperm DFI in Spearman correlation (n=298)

Age

0.865

0.785-0.954

0.004

Abstinence time

0.926

0.719-1.193

0.551

Semen volume

0.548

0.390-0.771

0.001

Sperm concentration

0.978

0.962-0.994

0.008

Progressive motility

1.173

1.041-1.323

0.009

Sperm motility

0.985

0.907-1.069

0.713

Normal sperm morphology

0.716

0.487-1.051

0.088

TNPMS

1.307

1.012-1.687

0.040

Abnormal head

0.996

0.947-1.048

0.876

Intact acrosome

1.082

1.006-1.163

0.033

Acrosomal enzyme activity

0.996

0.975-1.019

0.750

Seminal plasma zinc

1.229

0.705-2.142

0.466

Serum LH

0.976

0.768-1.239

0.839

Serum FSH

1.086

0.888-1.328

0.422

Seminal plasma TG

1.677

0.046-60.819

0.778

Seminal plasma TC

0.807

0.224-2.913

0.744

Seminal plasma FSH

0.455

0.075-2.752

0.391

Seminal plasma estradiol

0.987

0.970-1.003

0.111