Univariate analyses showed that in PCOS patients, BMI, high-quality embryo ratio and number of transferred embryos were correlated with pregnancy rate; while in non-PCOS patients, age, BMI, infertile duration, basal FSH level, Gn dosage, fertilization rate, cleavage rate, high-quality embryo rate and number of transferred embryos were correlated with pregnancy rate (all P < 0.05). This evidence concerns the gene BRD2 and Infertility.