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. Author manuscript; available in PMC: 2011 Jan 5.
Published in final edited form as: Circulation. 2009 Dec 21;121(1):34–42. doi: 10.1161/CIRCULATIONAHA.109.869396

Table 1.

Association between CHQ Physical Functioning Summary Score and Cardiopulmonary Exercise Testing*

Univariable Multivariable**
Variable PE p PE p Reliability***
  Percent predicted maximum work rate (%) 0.216 <0.001 0.216 <0.001 79%
  Percent predicted VO2 at peak exercise (%) 0.198 <0.001
  Percent predicted VO2 at anaerobic threshold (%) 0.108 0.003
  Percent predicted maximum oxygen pulse (%) 0.079 0.03
  Resting oxygen saturation (%) 0.134 0.49
  Chronotropic index 1.699 0.77

PE, parameter estimate; VO2, oxygen consumption

Parameter estimates represent the degree of change in the Summary Score associated with a one integer unit change in the laboratory testing variable.

*

Analysis limited to 157 subjects with maximal effort indicated by a respiratory exchange ratio >1.1. Additionally, analysis of chronotropic index was further limited to those 134 subjects who did not have a current pacemaker.

**

R2=0.086 (R2 adjusted=0.079), p<0.001, n=157

***

From bootstrap bagging (presented for the variables included in the multivariable model)