Table 2.

Principal component factor analysis with promax rotation, Kansas City Cardiomyopathy Questionnaire

KCCQ 23 items	Factor components
	Social Interference	Physical Limitations	Symptoms	Independent	Care Self-efficacy
Total variance (explained=67.16%)	40.36%	8.70%	6.93%	5.80%	5.37%
Cronbach’s alpha at baseline (n=280)	0.904	0.842	0.856	0.80	0.626
Cronbach’s alpha at 6 months (n=243)	0.874	0.856	0.852	0.885	0.608
1. Dressing yourself	0.352	0.382a	0.283	0.832	0.043
2. Showering/bathing	0.261	0.318a	0.155	0.893	−0.021
3. Walking 1 block on level ground	0.450	0.784a	0.445	0.204	0.037
4. Doing yard work, housework or carrying groceries	0.570	0.812a	0.269	0.267	0.062
5. Climbing a flight of stairs without stopping	0.555	0.837a	0.379	0.295	0.137
6. Hurrying or jogging (as if to catch a bus)	0.478	0.763a	0.164	0.268	0.146
7. My symptoms have changed over 2 weeks	0.411	0.511	0.369a	−0.079	0.281
8. How many times did you have swelling in your feet, ankles or legs when you woke up in the morning	0.214	0.275	0.863a	0.137	0.069
9. How much has swelling in your feet, ankles or legs bothered you?	0.321	0.410	0.913a	0.121	0.056
10. How many times has fatigue limited your ability to do what you want?	0.778	0.588	0.407a	0.015	0.121
11. How much has your fatigue bothered you?	0.754	0.607	0.427a	−0.020	0.154
12. How many times has SOB limited your ability to do what you wanted?	0.694	0.808	0.528a	0.112	0.142
13. How much has your SOB bothered you?	0.619	0.778	0.557a	0.061	0.210
14. How many times have you been forced to sleep sitting up in a chair with at least 3 pillows because of SOB?	0.368	0.463	0.668a	0.094	−0.009
15. How sure are you that you know what to do, or whom to call, if your HF gets worse?	0.193	0.143	0.012	0.021	0.840a
16. How well do you understand what things you are able to do to keep your HF from getting worse?	0.182	0.130	0.110	−0.055	0.860a
17. How much has your HF limited your enjoyment of life?	0.834	0.605	0.342	0.173a	0.234
18. If you had to spend the rest of your life with HF as it is now, how would you feel about this?	0.769	0.483	0.335	0.170a	0.219
19. How often have you felt discouraged because of your HF?	0.770	0.424	0.243	0.050a	0.223
20. How much does HF affect your … hobbies, recreational activities	0.789a	0.559	0.145	0.303	0.148
21. Working or doing household chores	0.813a	0.696	0.287	0.306	0.132
22. Visiting family or friends out your home	0.821a	0.587	0.330	0.290	0.138
23. Intimate relationships with loved ones	0.721a	0.402	0.138	0.256	0.094

This table includes new suggested subscale names. Independent care was added as a subscale and the Quality of Life subscale has been eliminated. Numbers in bold represent the best factor fit for this analysis; numbers in italic are those that differ between this analysis and those originally published.

^aOriginal items that belong to each subscale.

HF, heart failure; SOB, shortness of breath.