LEP and idiopathic pulmonary fibrosis: The area under the ROC curve for leptin in distinguishing AE-IPF from S-IPF was 0.761 (95% CI, 0.644–0.879; p < 0.001) (Figure 3(a)) and for distinguishing decedents from survivors was 0.729 (95% CI, 0.596–0.862; p = 0.004) (Figure 3(b)).