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Receiver operating characteristic curves for predicting (a) disease severity and (b) mortality risk. For evaluating disease severity, the optimal cutoff value of the maximal KL-6 level was set at 495 U/mL. For predicting the risk of mortality, the optimal cutoff value of the maximal KL-6 level was set at 684 U/mL. KL-6, Krebs von den Lungen-6; AUC, area under the curve.
