Table 4.

Correlations between C-DEMQOL sum scores and validation measures

Measures	Alpha	(Total) Overall QOL	(S1) Meeting personal needs	(S2) Carer wellbeing	(S3) Carer-patient relationship	(S4) Confidence in the future	(S5) Feeling supported
C-DEMQOL scales
C-DEMQOL Total	0.93
C-DEMQOL S1	0.93	0.77
C-DEMQOL S2	0.87	0.87	0.67
C-DEMQOL S3	0.74	0.70	0.38	0.56
C-DEMQOL S4	0.87	0.82	0.49	0.70	0.52
C-DEMQOL S5	0.80	0.73	0.43	0.47	0.45	0.49
Carer measures (self-report)
GHQ-12(a)	0.88	− 0.63	− 0.45	− 0.61	− 0.41	− 0.57	− 0.40
Hospital anxiety and depression scale(a)	0.89	− 0.71	− 0.55	− 0.65	− 0.43	− 0.63	− 0.47
Zarit carer burden inventory(a)	0.91	− 0.79	− 0.65	− 0.68	− 0.60	− 0.69	− 0.49
WHOQOL physical health	0.83	0.61	0.47	0.51	0.42	0.53	0.42
WHOQOL psychological	0.83	0.63	0.46	0.55	0.45	0.54	0.47
WHOQOL social relationships	0.69	0.45	0.36	0.32	0.33	0.33	0.44
WHOQOL environment	0.74	0.57	0.47	0.45	0.34	0.46	0.48
SF12 physical	0.85	0.39	0.30	0.30	0.27	0.33	0.30
SF12 mental	0.80	0.70	0.53	0.65	0.47	0.61	0.48
Personal Wellbeing scale	0.74	0.63	0.44	0.56	0.42	0.54	0.49
BADLS help(a)	0.89	− 0.32	− 0.53	− 0.23	− 0.10ns	− 0.20	− 0.15
Person with dementia measures (report by proxy)
DEMQOL-proxy	0.91	0.23	0.13	0.18	0.10ns	0.24	0.21
Neuropsychiatric inventory(a)	0.79	− 0.45	− 0.30	− 0.47	− 0.46	− 0.32	− 0.26
Clinical dementia rating(a)	0.95	− 0.08ns	− 0.13	− 0.17	− 0.07ns	0.05ns	0.03ns
BADLS dependence(a)	0.96	− 0.12	− 0.20	− 0.22	− 0.09ns	0.05ns	0.04ns

(a) construct is keyed in the opposite direction to C-DEMQOL (i.e. indicates distress or low QOL). Correlations for such constructs have been reversed when computing the average convergent/discriminant correlation. Hypothesized convergent relationships with C-DEMQOL subscale scores used to compute convergent correlations are bold. The C-DEMQOL total score is not included in calculations, because the subscale scores already account for the total variance. (ns) Correlations are not significant at the 0.05 level, two-tailed. All other correlations are significant