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Receiver operating characteristic (ROC) curve for ΔLzapp% in relation to CAT.
Note: ROC curves estimate the ability of Lzapp change (as percentage of baseline) to predict a significant improvement in CAT after PR (AUC=0.76, cutoff >9%, sensitivity=80%, specificity=62%).
Abbreviations: AUC, area under the curve; Lzapp, length of diaphragm zone of apposition; FRC, functional residual capacity; CAT, COPD Assessment Test; PR, pulmonary rehabilitation.
