Baseline characters including maternal age, body mass index (BMI), antral follicle count (AFC), infertility duration, infertility type, follicle stimulation hormone (FSH), luteinizing hormone (LH), estrogen (E2) at the start of pituitary downregulation, Gn dose, Gn time, number of oocytes retrieved and clinical pregnancy rate were compared between two groups. This evidence concerns the gene BRD2 and Infertility.