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Figure 3 Receiver operating characteristic curve concerning death at 35 months for NT-proBNP on admission, NT-proBNP at 6 h, and the relative change with an area under the curve (95% confidence interval) of 0.820 (0.784–0.856), 0.822 (0.786–0.857), and 0.554 (0.497–0.611), respectively. NT-proBNP = N-terminal pro brain natriuretic peptide.