PLOD1 and Infertility: There were no significant differences in age (P = 0.158), body mass index (P = 0.631), infertility duration (P = 0.208), the primary infertility rate (P = 0.362), causes of infertility (P = 0.984), basic follicle-stimulating hormone (FSH) levels (P = 0.445), luteinizing hormone (LH) levels (P = 0.235), anti-Mullerian hormone (AMH) levels (P = 0.364), or endometrial thickness (P = 0.075) on the day of human chorionic gonadotrophin (hCG) injection among the three patient groups.