The number of retrieved oocytes [OR: 1.3(95 CI: 1.1-1.6), Wald: 8.0, and P = 0.004] and basal AMH value [OR: 5.4 (95 CI: 1.1-27.9), Wald: 4.1, and P = 0.04] (but not PCOS, age, and BMI) were significant independent predicting factors of OHSS. The gene discussed is AMH; the disease is polycystic ovary syndrome.