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. Author manuscript; available in PMC: 2010 Oct 15.
Published in final edited form as: Am J Cardiol. 2009 Aug 28;104(8):1116–1121. doi: 10.1016/j.amjcard.2009.05.059

Table 3.

Cox Regression Analysis Results

Ischemic Heart Failure Subgroup
Variable Chi-square p-value
Minute Ventilation/Carbon
Dioxide Production Slope		 48.3 <0.001
Variable Residual Chi-square p-value
Body Mass Index
(Obese vs. Overweight/normal weight)* 		15.6
(Univariate chi square: 15.9, p<0.001)		 <0.001
Peak Oxygen Consumption* 9.0
(Univariate chi square: 24.8, p<0.001)		 0.003
Left Ventricular Ejection Fraction 1.1
(Univariate chi square: 7.1, p=0.008)		 0.29
Age 0.02
(Univariate chi square: 2.4, p=0.12)		 0.88
Non-Ischemic Heart Failure Subgroup
Variable Chi-square p-value
Minute Ventilation/Carbon
Dioxide Production Slope		 43.4 <0.001
Variable Residual Chi-square p-value
Left Ventricular Ejection Fraction* 30.0
(Univariate chi square: 30.0, p<0.001)		 <0.001
Age* 6.8
(Univariate chi square: 3.6, p=0.06)		 0.009
Body Mass Index
(Obese vs. Overweight/normal weight)* 		4.7
(Univariate chi square: 17.2, p<0.001)		 0.03
Peak Oxygen Consumption 0.53
(Univariate chi square: 12.3, p<0.001)		 0.47
*

Retained in multivariate regression