. 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 4.

Multivariate Cox Regression Analysis for Cardiopulmonary Exercise Test Variables According to Age Subgroup

≤45 years (n=263; 45 events)	46-65 years (n=807; 107 events)	≥65 years (n=535; 73 events)
Strongest Multivariate Predictor
VE/VCO₂ Slope Chi Square: 38.8, p<0.001^*	VE/VCO₂ Slope Chi Square: 119.5, p<0.001^*	VE/VCO₂ Slope Chi Square: 72.8, p<0.001^*
Secondary Multivariate Predictor
Multivariate Regression #1: Peak VO₂
Residual Chi-Square: 10.7, p<0.01^,^#*	Residual Chi-square: 25.9, p<0.001^*	Residual Chi-Square: 13.7, p<0.001^,^#*
Multivariate Regression #2: Percent-Predicted Peak VO₂
Residual Chi-Square: 9.5, p<0.01^*	Residual Chi-square: 26.1, p<0.001^,^#*	Residual Chi-Square: 5.2, p<0.05^*

Retained in multivariate regression

Stronger secondary prognostic marker