Table 3.

Performance of oxygen metabolism markers for predicting death using logistic regression analysis.

	Cut-off point	AUC	95% CI	p-value	Youden Index
SaO2, %	43	0.94	0.90–0.98	<0.001	0.75
ScvO2, %	29	1	1	<0.001	1.0
PaO2, mmHg	31.6	0.81	0.73–0.89	<0.001	0.43
PaO2/FiO2, mmHg	144.5	0.96	0.93–0.99	<0.001	0.79
DO2, ml/min	401	0.95	0.92–0.99	<0.001	0.83
VO2, ml/min	124.6	1	1	<0.001	1.0
O2ER, %	30.2	1	1	<0.001	1.0

AUC, area under curve; CI, confidence interval; SaO₂, oxygen saturation in arterial blood; ScvO₂, oxygen saturation in central venous blood; PaO_2, arterial partial pressure of oxygen; FiO₂, fraction of inspired oxygen; PaO₂/FiO_2, respiratory index; DO₂, oxygen delivery; VO₂, oxygen consumption; O₂ER, oxygen extraction.