Fig. 5.

DFI and HDS values after four different treatments. (a) and (b) indicate the semen data from different fertile men: (a): volunteer A; (b): volunteer B. DGC = Percoll density gradient centrifugation. Wash = original semen washed by HTF. Vertical axis indicates the value of DFI and HDS. The values of DFI and HDS among four different treatments were compared. ^a–d Different letters in DFI or HDS indicate statistically significant differences (P < 0.05) by the Tukey-Kramer method following ANOVA.