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The ROC curve for DE (average) after SBT predicting re-intubation within 1 week in the respiratory failure subgroup. The AUC of DE (average) after SBT was 0.805 (P = 0.008). A cut-off value ≤ 12.6 mm showed the highest diagnostic accuracy with a sensitivity and specificity of 80% and 68.4%, respectively. AUC area under curve, DE diaphragmatic excursion, ROC receiver operating characteristic curve, SBT spontaneous breathing trial
