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Receiver operating characteristic (ROC) curve for the 6MWT on tracks of 30 m cut-off point to discriminate the patients where the difference in walking distance between the tracks of 30 m and 20 m was clinically relevant, considering the minimum important difference of 30 m for the 6MWT. Cut-off = 430 m; area under the ROC curve (AUC) = 0.75 [95% CI: 0.57, 0.93]; p = 0.02; Sensitivity = 67% and Specificity = 72%.
