Development of a short form of the Singapore Caregiver Quality of Life Scale – Dementia: SCQOLS-D-15

Journal of Patient-Reported Outcomes

Table 3 Measurement properties of the long form and selected n-item subsets for each domain

Domain	Items	r(NPI)	r(PPI)	Alpha	ICC
Physical Well-being	All 12 items (long form)	0.60	0.12	0.92	0.86
	PW8	0.55	−0.09		0.65
	PW8 + PW11	0.55	0.06	0.75	0.73
	PW6 + PW8 + PW11	0.58	0.06	0.84	0.81
	PW6 + PW7 + PW8 + PW11	0.59	0.07	0.90	0.82
Mental Well-being	All 18 items (long form)	0.64	0.11	0.91	0.89
	MW8	0.57	0.09		0.80
	MW5 + MW8	0.67	0.17	0.80	0.90
	MW5 + MW8 + MW18	0.70	0.22	0.82	0.93
	MW4 + MW5 + MW8 + MW18	0.68	0.26	0.88	0.92
	MW4 + MW5 + MW7 + MW8 + MW18	0.67	0.25	0.91	0.90
Experience & Meaning	All 16 items (long form)	0.28	0.44	0.92	0.75
	EM6	0.21	0.50		0.71
	EM6 + EM12	0.30	0.47	0.68	0.76
	EM5 + EM6 + EM12	0.31	0.44	0.78	0.72
	EM5 + EM6 + EM7 + EM12	0.31	0.48	0.85	0.72
	EM4 + EM5 + EM6 + EM7 + EM12	0.31	0.44	0.88	0.74
Impact on Daily Life	All 13 items (long form)	0.76	0.06	0.96	0.87
	DL5	0.65	0.13		0.77
	DL5 + DL8	0.69	0.09	0.85	0.80
	DL4 + DL5 + DL8	0.70	0.12	0.90	0.78
	DL3 + DL4 + DL5 + DL8	0.70	0.11	0.94	0.77
Financial Well-being	All 4 items (long form)	0.58	−0.08	0.95	0.86
	FW3	0.54	− 0.12		0.77
	FW1 + FW3	0.61	−0.05	0.89	0.79
	FW1 + FW3 + FW4	0.60	−0.08	0.94	0.83

Abbreviations: r(NPI) and r(PPI) Pearson’s correlation coefficients with Negative Personal Impact and with Positive Personal Impact; ICC intraclass correlation coefficient