Figure 3. ROC curve of BAL KL-6 (A), BAL CRP (B), and a combination of BAL neutrophilia, KL-6, and CRP (C) for predicting low DLCO in the study population.

BAL: bronchoalveolar lavage; AUC: area under the curve; ROC: receiver operating characteristics; DLCO: diffusing capacity of the lungs for carbon monoxide; KL-6: Krebs von den Lungen-6; CRP: C-reactive protein.