Psychometric properties of the Japanese version of the Kansas City Cardiomyopathy Questionnaire in Japanese patients with chronic heart failure

Table 6 Test-retest analysis: changes in KCCQ scores among clinically stable patients

KCCQ	N	Scores (mean ± SD)			ICC (95% CI)
KCCQ	N	Timepoint 1^a	Timepoint 2^b	Change in scores	ICC (95% CI)
Domains
Physical limitations	56^c	91.0 ± 11.9	93.1 ± 11.1	2.3 ± 8.9	0.69 (0.52–0.81)
Symptom frequency	58	91.2 ± 14.9	90.7 ± 13.8	−0.5 ± 9.6	0.78 (0.65–0.86)
Symptom severity	58	94.5 ± 9.6	95.5 ± 7.4	1.0 ± 6.8	0.68 (0.51–0.80)
Symptom stability	58	60.3 ± 19.9	59.9 ± 19.3	−0.4 ± 25.0	0.19 (− 0.08–0.43)
Self-efficacy	58	82.8 ± 19.6	80.6 ± 18.8	−2.2 ± 15.9	0.66 (0.48–0.78)
Social limitations	52^d	93.2 ± 13.9	92.9 ± 15.6	0.5 ± 10.1	0.76 (0.61–0.86)
Quality of life	58	81.0 ± 13.5	85.2 ± 14.0	4.2 ± 11.1	0.65 (0.45–0.78)
Summary scores
Total symptom score	58	92.9 ± 11.9	93.1 ± 10.0	0.3 ± 7.6	0.77 (0.63–0.85)
Clinical summary score	58	92.0 ± 10.1	93.2 ± 9.0	1.1 ± 5.9	0.80 (0.69–0.88)
Overall summary score	58	89.4 ± 9.9	91.1 ± 10.4	1.7 ± 5.5	0.84 (0.74–0.91)

Test-retest analysis was conducted using data of 58 patients who were considered clinically stable, which was defined as no change in EQ-5D-3L scores, between the two timepoints
^aAt week 8 for the SOCRATES studies and at last day of treatment for the ARTS-HF Japan study
^bAt week 12 for the SOCRATES studies and at 30 days after the last treatment for the ARTS-HF Japan study
^cData of 56 patients were analyzed due to responses coded as missing data in question 1 (6 items)
^dData of 52 patients were analyzed due to responses coded as missing data in question 15 (4 items)
KCCQ Kansas City Cardiomyopathy Questionnaire; ICC intraclass correlation coefficient; CI confidence interval; SD standard deviation

ISSN: 1477-7525