Fig. 2
ROC curve analysis of the DLCO SB%pred, the DLCO/VA%pred (A), the CAT score (B), the mean density, the PD 15 (C), the emphysema volume, and the %LAA (D) for predicting EID. ROC receiver operating characteristic; EID exercise-induced desatuation; DLCO SB%pred lung carbon monoxide diffusion as a percentage of predicted value; DLCO/VA%pred lung carbon monoxide diffusion per liter of alveolar air volume as a percentage of predicted value; CAT COPD Assessment Test; PD15 15th percentile point; %LAA % low attenuation areas