Fig. 1From: Response to “Early prediction of noninvasive ventilation failure in COPD patients: derivation, internal validation, and external validation of a simple risk score”The AUC for prediction of NIV failure. H2, H12, and H24 mean the HACOR score collected at 2, 12, and 24 h of NIV. H0–2, H0–12, and H0–24 mean the difference from initiation to 2, 12, and 24 h of NIV, respectivelyBack to article page