FNDC5 and polycystic ovary syndrome: The bivariate correlation analysis among PCOS subjects demonstrated a significant positive correlation between serum irisin and systolic blood pressure (SBP) (r = 0.429, P = 0.013), diastolic blood pressure (DBP) (r = 0.345, P = 0.049), total cholesterol (r = 0.530, P = 0.002), LDL (r = 0.394, P = 0.023), serum testosterone (r = 0.356, P = 0.042), and visceral fat (r = 0.389, P = 0.025).