Table 3.

Correlations Between Patient-Reported Measures and Continuous Clinical Measures

PRO Measure	Clinical Measure	Zero-Order Correlation (95% CI)	Adjusted Correlation (95% CI)
EuroQol VAS	Peak VO2	0.094 (0.052 to 0.135)	0.137 (0.096 to 0.179)
	Six-minute walk	0.112 (0.071 to 0.153)	0.137 (0.095 to 0.178)
KCCQ overall score	Peak VO2	0.213 (0.173 to 0.252)	0.222 (0.177 to 0.265)
	Six-minute walk	0.271 (0.232 to 0.308)	0.278 (0.235 to 0.32)
KCCQ clinical summary	Peak VO2	0.282 (0.244 to 0.320)	0.274 (0.233 to 0.315)
	Six-minute walk	0.322 (0.285 to 0.358)	0.317 (0.276 to 0.357)
KCCQ subscales
Physical limitation	Peak VO2	0.309 (0.271 to 0.346)	0.293 (0.252 to 0.334)
	Six-minute walk	0.345 (0.309 to 0.381)	0.330 (0.288 to 0.369)
Total symptom	Peak VO2	0.207 (0.168 to 0.246)	0.207 (0.164 to 0.248)
	Six-minute walk	0.244 (0.205 to 0.282)	0.239 (0.197 to 0.28)
Social limitation	Peak VO2	0.152 (0.111 to 0.193)	0.162 (0.118 to 0.205)
	Six-minute walk	0.209 (0.169 to 0.248)	0.216 (0.172 to 0.26)
Self-efficacy	Peak VO2	0.049 (0.008 to 0.090)	0.031 (−0.011 to 0.072)†
	Six-minute walk	0.047 (0.006 to 0.088)	0.028 (−0.014 to 0.07)‡
Quality-of-life	Peak VO2	0.101 (0.060 to 0.142)	0.139 (0.094 to 0.183)
	Six-minute walk	0.166 (0.126 to 0.206)	0.194 (0.149 to 0.237)

Abbreviations: PRO, patient-reported outcome; CI, confidence interval; VAS, Visual Analog Scale; peak VO₂, peak oxygen consumption during cardiopulmonary exercise testing; KCCQ, Kansas City Cardiomyopathy Questionnaire.

^*Partial correlation coefficient after adjusting for significant patient characteristics listed in Table 1. All correlations are significantly different from zero with P < .05 except where noted.

^†Significantly different from zero (P = .15).

^‡Significantly different from zero (P = .20).