PLOD1 and syphilis: No significant differences were found in female age (P = 0.99), duration of infertility (P = 0.50), BMI (P = 0.15), or the basal FSH (P = 0.12), basal LH (P = 0.59) or basal E2 level (P = 0.81) between the syphilis and control groups.