The baseline characteristics included female age; body mass index; duration of infertility; fertilization type; infertility type; basal FSH concentration; basal E2 concentration; basal P concentration; antral follicle count (AFC); gonadotropin (Gn) dosage; Gn duration; E2 concentration, luteinizing hormone concentration, and P concentration on the hCG trigger day; endometrial thickness (EMT); the number of oocytes retrieved; the number of two pronuclear stage (2PN) embryos and embryo type. The gene discussed is BRD2; the disease is Infertility.