FSHB and polycystic ovary syndrome: After adjusting for confounding factors such as age, BMI, bFSH, bE2, dose of Gn, type of PCOS, years of infertility, and cycle outcome, the smooth curve fitting analysis revealed that the number of oocytes had a curvilinear relationship with the clinical pregnancy rate, live birth rate, CPR, and CLBR (Figure 2).