Table 4.

ROC analysis of VVR before weaning, mechanical ventilation duration before weaning, and mSOFA on weaning day for predicting weaning failure in post-cardiac surgery patients.

Variables	AUC	P	Optimal cut-off value	95% CI		Sensitivity	Specificity
				Lower limit	Upper limit
VVR before weaning (score)	0.793	<0.001	18.46	0.740	0.845	0.698	0.801
Mechanical ventilation duration before weaning (h)	0.738	<0.001	20.50	0.662	0.782	0.709	0.758
mSOFA on weaning day (score)	0.722	<0.001	4.33	0.662	0.782	0.547	0.774

AUC, area under the receiver operating characteristic curve; CI, confidence interval; VVR, vasoactive-ventilation-renal score; mSOFA, modified sequential organ failure assessment.