At partial correlation analyses, oxidative stress-related parameters (ROS production and lipid peroxidation) were significantly related with plasma RI and FF RI after controlling for endometriosis, age, smoking habits, body mass index (BMI), in vitro fertilization-embryo transfer (IVF-ET)/intracytoplasmic sperm injection (ICSI), follicle stimulating hormone (FSH), luteinizing hormone (LH), estradiol (E2), Anti-Müllerian Hormone (AMH) and duration of infertility (Table 1). This evidence concerns the gene PLOD1 and endometriosis.