NAMPT and polycystic ovary syndrome: No statistically significant difference was demonstrated in plasma visfatin levels between the PCOS-IR (92.28±20.05 ng/ml), PCOS non-IR (108±44.28 ng/ml), control IR (96.83±34.06 ng/ml) and control non-IR (91.58±33.22) subgroups (P=0.467, among four subgroups; Fig. 2).