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Figure 6 Receiver-operating characteristic curves for detection of left ventricular ejection fraction (LVEF) <30% (top), 40% (middle), and 50% (bottom) by brain natriuretic peptide (BNP) (solid lines) or amino terminal pro-brain natriuretic peptide (NTproBNP) (dotted lines) in 1,049 patients with asymptomatic stable ischemic heart disease. AUC = area under the curve.