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. Author manuscript; available in PMC: 2020 May 18.
Published in final edited form as: Circ Heart Fail. 2013 Feb 7;6(2):211–218. doi: 10.1161/CIRCHEARTFAILURE.112.000073

Table 3.

Predictive Accuracy of CPX Parameters and Composite Risk Score

Cardiac Mortality
 Major Events
Variable C Index C Index
Peak VO2≤14 mL·kg−1·min−1 0.61 0.67
HHR≤6 beats at 1 min 0.61 0.60
VE/VCO2 slope ≥34 0.66 0.70
OUES≤1.4 0.62 0.65
PetCO2<33 mm Hg 0.58 0.61
Composite risk score 0.70 0.72

CPX indicates cardiopulmonary exercise test; HRR, heart rate recovery at 1 min; OUES, oxygen uptake efficiency slope; and PetCO2, end-tidal carbon dioxide pressure.