As expected, no significant between-group differences were found in post-matching analysis with regard to all baseline characteristics, including female age, BMI, infertility type and duration, gravidity, parity, basal FSH, initial treatment, oocytes retrieved, total number of embryos, transferred embryos as well as endometrial thickness before FET (P > 0.05; see Table 1). This evidence concerns the gene BRD2 and Infertility.