. Author manuscript; available in PMC: 2013 Dec 25.

Published in final edited form as: J Am Coll Cardiol. 2012 Nov 21;60(25):2653–2661. doi: 10.1016/j.jacc.2012.08.1010

Table 3. Correlations of 6MWD to CPX Indices.

Parameter	N	Unadjusted vs. Adjusted^*	Correlation with 6MWD	P value
Peak VO₂ (ml/kg/min)	2030	Unadjusted R	0.54	P<.0001
	1920	Adjusted R^*	0.33	P<.0001
VE/VCO₂ slope	2014	Unadjusted R	−0.26	P<.0001
	1905	Adjusted R^*	−0.17	P<.0001

6MWD-6 minute walk distance; VO₂-oxygen consumption; VE/VCO₂-minute ventilation-carbon dioxide production

“Adjusted Correlations” are the partial correlations from models including covariates in the final adjusted model of 6MW or any CPX Parameter