How useful is the EQ-5D in assessing the impact of caring for people with Alzheimer’s disease?

Table 3 Correlations^a between caregiver EQ-5D, T-IADL, and ZBI scores

Variable	Time point	EQ-5D VAS score				EQ-5D index score				T-IADL
Variable	Time point	n	Coefficient	95% CI	P value	n	Coefficient	95% CI	P value	n	Coefficient	95% CI	P value
ZBI total score	Baseline vs baseline	1483	−0.21	−0.26, −0.16	<0.001	1483	−0.21	−0.25, −0.16	<0.001	1484	0.30	0.25, 0.34	<0.001
	18 months vs 18 months	929	−0.19	−0.26, −0.13	<0.001	929	−0.21	−0.27, −0.15	<0.001	928	0.22	0.15, 0.28	<0.001
	Change score vs change score^b	928	−0.16	−0.22, −0.09	<0.001	928	−0.09	−0.15, −0.03	0.006	926	0.12	0.05, 0.18	<0.001
T-IADL	Baseline vs baseline	1482	−0.15	−0.19, −0.10	<0.001	1482	−0.14	−0.19, −0.09	<0.001
	18 months vs 18 months	930	−0.08	−0.15, −0.02	0.010	930	−0.10	−0.16, −0.03	0.004
	Change score vs change score^b	928	−0.07	−0.13, −0.01	0.030	928	0.02	−0.04, 0.08	0.546

CI confidence interval; EQ-5D EuroQol-5 dimension questionnaire; T-IADL time spent on instrumental activities of daily living (hours/month); VAS visual analog scale; ZBI Zarit Burden Interview
^aSpearman correlation coefficients, 95% CIs, and P values
^bChange in score from baseline to 18 months

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