Fig. 3. Receiver operating characteristic curve for admission BNP levels to predict subsequent readmission within 1 yr. The cut-off value was estimated to be 709.1 pg/mL, and the sensitivity, specificity, positive predictive value, and negative predictive values were 80.6%, 77.4%, 80.6%, and 77.4%, respectively. AUC, area under the curve; BNP, brain natriuretic peptide.