Table 3.

Correlations Between Changes in Health Status and Changes in Functional Capacity

Health Status and Functional Capacity	3 Months, r (95% CI)*†	12 Months, r (95% CI)*†
KCCQ overall score
Peak VO2, mL/kg/min	0.29 (0.21 to 0.39)	0.31 (0.24 to 0.39)
6-minute walk distance, m	0.26 (0.20 to 0.34)c	0.31 (0.26 to 0.38) c
KCCQ subscales
Physical limitation
Peak VO2, mL/kg/min	0.28 (0.19 to 0.40)	0.32 (0.25 to 0.41)
6-minute walk distance, m	0.31 (0.23 to 0.42)	0.34 (0.28 to 0.43)
Symptoms
Peak VO2, mL/kg/min	0.26 (0.18 to 0.35)	0.27 (0.20 to 0.35)c
6-minute walk distance, m	0.25 (0.17 to 0.35)c	0.29 (0.22 to 0.37) c
Quality of life
Peak VO2, mL/kg/min	0.24 (0.15 to 0.34)c	0.26 (0.18 to 0.34)c
6-minute walk distance, m	0.18 (0.11 to 0.25)c	0.23 (0.17 to 0.30)c
Social limitation
Peak VO2, mL/kg/min	0.28 (0.20 to 0.38)	0.30 (0.23 to 0.38)
6-minute walk distance, m	0.22 (0.16 to 0.30)c	0.29 (0.23 to 0.37)c
EQ-5D Visual Analog Scale
Peak VO2, mL/kg/min	0.13 (0.02 to 0.25)	0.16 (0.07 to 0.27)
6-minute walk distance, m	0.18 (0.07 to 0.31)	0.28 (0.19, to 0.39)

Abbreviations: CI, confidence interval; KCCQ, Kansas City Cardiomyopathy Questionnaire.

^*Adjusted for all significant patient characteristics listed in Table 1 and their interactions.

^†Confidence intervals estimated using the bootstrap method with replacement and constructed using the bias-corrected and accelerated method.

^‡Correlation coefficient significantly different from corresponding coefficient with KCCQ physical limitation subscale at P < .05.