NPY concentration was not significantly correlated with age (p = 0.175, r = -0.147; p = 0.094, r = 0.283; Fig. 4C) nor with serum Anti-Müllerian hormone (AMH) levels (p = 0.371, r = -0.0535; p = 0.088, r = -0.291; Fig. 4D) among women without or with PCOS. Here, NPY is linked to polycystic ovary syndrome.