Effect of pre-discharge cardiopulmonary fitness on outcomes in patients with ST-elevation myocardial infarction after percutaneous coronary intervention

Table 6 Optimal cut-off points and related diagnostic value by ROC analysis

	Cut-off point	Sensitivity	Specificity	AUC	P
VO₂ at VT (ml/kg/min)	10.5	0.659	0.633	0.666	0.007
Ve/VCO₂ slope	33.4	0.733	0.545	0.658	0.001
E-VCO₂(L/min)	0.6	0.659	0.633	0.646	0.017
R-P_ETCO₂ (mm Hg)	30.5	0.511	0.733	0.623	0.046
E-P_ETCO₂ (mm Hg)	32.5	0.716	0.567	0.67	0.005
△P_ETCO₂(mm Hg)	2.5	0.807	0.433	0.638	0.024
△CO₂(L/min)	0.3	0.739	0.533	0.636	0.027

VO₂ at VT Oxygen consumption per kilogram of weight per minute at anaerobic threshold, Ve/VCO₂ slope Minute ventilation/ Carbon dioxide production slope, E-VCO₂ Exercise carbon dioxide production, R-P_ETCO₂ Rest partial pressure of end-tidal carbon dioxide, E-P_ETCO₂ Exercise partial pressure of end-tidal carbon dioxide, △P_ETCO₂ Margin of partial pressure of end-tidal carbon dioxide, △CO₂ Margin of minute ventilation carbon dioxide production, AUC Area under the curve

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