NOS3 and male infertility: We found that eNOS rs2070744 was correlated with an increased risk of male infertility (C vs. T: odds ratio [OR], 1.48; 95% confidence interval [CI], [1.19–1.85]; CC vs. TT: OR, 2.59; 95% CI, [1.40–4.80]; CT vs. TT: OR, 1.17; 95% CI, [1.00–1.38]; CC vs. CT + TT: OR, 2.50; 95% CI, [1.35–4.62]; CC + CT vs. TT: OR, 1.41; 95% CI, [1.21–1.64]).