Psychometric performance of the CFQ-R-8D compared to the EQ-5D-3L and SF-6D in people with cystic fibrosis

Journal of Patient-Reported Outcomes

Table 5 Frequencies of CFQ-R-8D when generic measures equal 1 (i.e., no problems in any dimension) at baseline

	Level 1	Level 2	Level 3	Level 4
EQ-5D-3L trials (EQ-5D-3 L = 1)n = 607/997
CFQ-R-8D, n
Physical Functioning	515	81	11	0
Vitality	281	303	20	3
Emotion	314	277	12	4
Role Functioning	507	87	12	1
Cough	42	302	227	36
Breathing Difficulty	408	193	6	0
Abdominal Pain	422	178	7	0
Body Image^a	459	112	34	2
SF-6D trial (SF-6D = 1)n = 24/413
CFQ-R-8D, n
Physical Functioning	21	3	0	0
Vitality	18	6	0	0
Emotion	21	3	0	0
Role Functioning	21	2	0	1
Cough	4	15	4	1
Breathing Difficulty	20	4	0	0
Abdominal Pain	16	7	1	0
Body Image^a	22	1	0	1

CFQ-R-8D: Cystic Fibrosis Questionnaire–Revised–8 Dimensions; SF-6D: Short Form 6 dimensions
^a Body Image has only two levels in the classifier but is based on an item with four levels (i.e., very true, somewhat true, somewhat false, and very false). Disutility is associated with “somewhat true = 3” and “very false = 4”