RBP4 and Insulin resistance: MI3 determined by the OGTT was correlated with values obtained from fasting levels of insulin, leptin and adiponectin (Fig. 2A, r = 0.913); insulin, leptin, RBP4 and adiponectin (Fig. 2B, r = 0.903); and insulin, leptin, glycated albumin and adiponectin (Fig. 2C, r = 0.913), suggesting that the combination of insulin, leptin and adiponectin is sufficient for predicting insulin resistance.