Comparing the psychometric properties of EQ-5D-3L and EQ-5D-5L proxy ratings by informal caregivers and a health professional for people with dementia

Table 6 Convergent validity of the EQ-5D-3L and the EQ-5D-5L assessed using Spearman Correlation

	EQ-VAS (proxy-rating)		Qol-AD (patient self-rating)		Qol-AD (caregiver proxy-rating)		B-ADL (patient rating)		GDS (patient rating)
	3L	5L	3L	5L	3L	5L	3L	5L	3L	5L
Proxy (caregiver)
Mobility	‡	− 0.340	− 0.438	− 0.392	‡	‡	‡	‡	‡	‡
Self-care	− 0.331	− 0.392	‡	− 0.365	− 0.519	− 0.613	‡	‡	‡	0.320
Usual activities	− 0.459	− 0.482	‡	− 0.302	− 0.542	− 0.552	0.325	0.305	0.340	0.366
Pain/discomfort	‡	‡	− 0.303	− 0.307	‡	‡	‡	‡	‡	‡
Anxiety/depression	‡	‡	‡	‡	‡	‡	‡	‡	‡	‡
EQ-5D index score	0.454	0.471	0.399	0.457	0.486	0.444	‡	‡	‡	− 0.306
Proxy (care manager)
Mobility	− 0.479	− 0.639	− 0.381	− 0.326	‡	‡	‡	‡	‡	‡
Self-care	− 0.692	− 0.720	‡	− 0.360	− 0.411	− 0.478	‡	‡	‡	‡
Usual activities	− 0.660	− 0.722	‡	‡	‡	− 0.373	‡	0.300	‡	0.305
Pain/discomfort	‡	‡	‡	‡	‡	‡	‡	‡	‡	‡
Anxiety/depression	‡	‡	‡	‡	‡	‡	‡	‡	‡	‡
EQ-5D index score	0.698	0.643	0.312	0.326	0.412	0.341	‡	‡	− 0.324	− 0.350

SD standard deviation, ‡ poor correlation represents values less than 0.3, QoL-AD Quality of Life in Alzheimer's Diseases, ADL Activities of Daily Living, GDS Geriatric Depression Scale, superior correlations are demonstrated in bold

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