Semen parameters by rs12676 and rs1025689 genotype.

Semen volume, total number of sperm per ejaculate and sperm concentration was determined by measuring the volume of the ejaculate before washing and counting the number of sperm using a hemocytometer. For rs12676 N = 19 (GG), 22 (GT) or 5 (TT). For rs1025689 N = 12 (GG), 22 (GT), 11 (CC). Values are mean ± SEM. Statistical differences among groups were tested on log 10 transformed data using ANOVA and Tukey-Kramer HSD.*indicates P†World Health Organization reference values and 5% lower reference limit for human semen characteristics within the general population.