Table 3.

Construct and concurrent validity

	Time-dependent Burden	Emotional Burden	Exisitential Burden	Physical Burden	Service-related Burden	Total Care Burden	BIC Total
SF-8
PF (Physical Functioning)	-0.36	-0.35	-0.40	-0.52	-0.26	-0.44	-0.52
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
RP (Role functioning Physical)	-0.47	-0.48	-0.49	-0.57	-0.28	-0.56	-0.65
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
BP (Bodily Pain)	-0.41	-0.38	-0.40	-0.64	-0.26	-0.44	-0.56
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
GH (General Health perceptions)	-0.39	-0.40	-0.40	-0.56	-0.27	-0.46	-0.59
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
VT (Vitality)	-0.35	-0.41	-0.41	-0.50	-0.26	-0.41	-0.47
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
SF (Social Functioning)	-0.59	-0.48	-0.49	-0.54	-0.31	-0.57	-0.62
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
RE (Role functional Emotional)	-0.52	-0.50	-0.51	-0.55	-0.25	-0.58	-0.60
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
MH (Mental Health)	-0.55	-0.58	-0.55	-0.55	-0.29	-0.59	-0.64
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
CES-D	0.49	0.54	0.53	0.48	0.32	0.51	0.62
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
ZBI	0.76	0.72	0.70	0.68	0.38	0.80	0.84
p-value	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001

figures indicate Pearson's correlation coefficient

BIC: Burden Index of Caregivers

SF-8: Health related quality of life scale, Short Form-8

CES-D: Center for Epidemiologic Studies Depression scale

ZBI: Zarit Burden Interview