SHBG and polycystic ovary syndrome: In this regard, this study was designed first to investigate menstrual cycle; second, to identify the symptoms and prevalence of clinically significant PMS; third, to estimate the prevalence of PCOS; and lastly, to identify the relationship between health-related behaviors (smoking, drinking, eating habits and nutrients intake), body composition and blood indexes (total testosterone (T), sex hormone binding globulin (sHBG), fasting blood sugar (FBS) and insulin) according to menstrual cycle regularity and the presence or absence of PCOS.