NOS3 and male infertility: And eNOS rs1799983 was correlated with an increased risk of male infertility (allele contrast T vs. G: OR, 1.41; 95% CI, [1.01–1.96]; P = .043; recessive model TT vs. TG + GG: OR, 2.00; 95% CI, [1.03–3.90]; P = .042).