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Receiver operating characteristic (ROC) curve for ΔLzapp% in relation to 6MWD.
Note: ROC curves estimate the ability of Lzapp change (as percentage of baseline) to predict a significant improvement in 6MWD after PR (AUC=0.83, cutoff ≥10%, sensitivity=83%, specificity=74%).
Abbreviations: AUC, area under the curve; Lzapp, length of diaphragm zone of apposition; FRC, functional residual capacity; 6MWD, 6-minute walking distance; 6MWT, 6-minute walking test; PR, pulmonary rehabilitation.
