Patients’ characteristics and outcomes of COH
A total of 8903 patients who underwent FET were enrolled in the present study, and categorised as 1887 PCOS women and 7016 non-PCOS women. Of the 1887 women with PCOS, 452 showed phenotype A (HA+OA+PCO, 23.95% of PCOS), 88 presented with phenotype B (HA+OA, 4.66% of PCOS), 119 revealed phenotype C (HA+PCO, 6.31% of PCOS), and 1228 displayed phenotype D (OA+PCO, 65.08% of PCOS).
Patient’s baseline characteristics and ovarian responses of the four PCOS phenotypes and control group are listed in Table 1 . A significant difference did not exist in histories of spontaneous abortion and premature delivery between the four PCOS phenotypes and control group (P = 0.922, P = 0.495, respectively). No significant differences in the type of infertility, fasting blood-glucose (FBG), gonadotropin dose and high-quality embryos between the four PCOS phenotypes were found. Significant differences were observed with regard to age, BMI, SBP, DBP, duration of infertility, follicle-stimulating hormone, luteinizing hormone, total testosterone concentration (To), anti-Müllerian hormone (AMH), antral follicle count (AFC), the number of follicles of diameter ≥ 14 mm and estradiol (E2) levels on the HCG trigger day, and the number of retrieved oocytes between the four PCOS phenotype and control groups (all P -values were < 0.001).