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A) ROC Curve of the proficiency of diaphragm excursion as a predictor of NIV response. B) Dot plot separating NIV-responder and NIV non-responder patients according to their diaphragm excursion. The horizontal line indicates the cut-off point with the best separation (minimal false negative and false positive results) between the two groups. LEGEND: DE, diaphragm excursion;
