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. Author manuscript; available in PMC: 2012 Sep 15.
Published in final edited form as: Int J Cardiol. 2010 Jun 30;151(3):278–283. doi: 10.1016/j.ijcard.2010.05.056

Table 3.

Receiver Operating Characteristic and Univariate Cox Regression Analysis for Cardiopulmonary Exercise Test Variables According to Age Subgroup: All Events

Area Under ROC Curve
(95% CI)		 p-value Hazard Ratio (95% CI) p-value
VE/VCO2 Slope
≤45 years 0.76 (0.69-0.82) <0.001 1.07 (1.04-1.09) <0.001
46-65 years 0.76 (0.71-0.81) <0.001 1.07 (1.05-1.08) <0.001
≥65 years 0.75 (0.70-0.81) <0.001 1.07 (1.05-1.08) <0.001
Peak VO2
≤45 years 0.70 (0.62-0.78) <0.001 0.87 (0.82-0.92) <0.001
46-65 years 0.75 (0.70-0.80) <0.001 0.85 (0.81-0.88) <0.001
≥65 years 0.73 (0.67-0.79) <0.001 0.84 (0.80-0.89) <0.001
Percent-Predicted Peak VO2
≤45 years 0.71 (0.63-0.79) <0.001 0.96 (0.94-0.97) <0.001
46-65 years 0.77 (0.73-0.82) <0.001 0.96 (0.95-0.97) <0.001
≥65 years 0.68 (0.61-0.75) <0.001 0.98 (0.97-0.99) <0.001