Figure 1

Age cut-off value associated with increasing risk of death in ROC analysis. (n = 1638 patients/108 died). Legend: sensitivity (True Positive Rate), 1-specificity (False Positive Rate); scale is in decimals of sensitivity and specificity; interval every 0.2, i.e. 20%; green line—optimum cut-off point (max. Youden’s index = 0,38, cut-off point: 77,00), blue line—ROC curve with AUC 0.727, 95%CI 0.678–0.776, SE 0.025, p < 0.001, red line—classification due to chance with AUC 0.5. Abbreviations: ROC—receiver operating characteristic, AUC—area under the curve, SE—standard error. Method: ROC, AUC and SE analyzes performed according to Hanley and McNeil¹⁰.