Response shift in health-related quality of life measures in the presence of formative indicators

Table 4 Fit statistics for the reflective indicator models

Model	χ²	df	p-value	RMSEA	CFI	Δχ²	Δdf	p-value
Baseline	51.54	34	0.027	0.04	0.99	–	–	–
Constrained model^a	66.48	41	0.007	0.05	0.98	14.45	7	0.044
Constrained model^b	61.05	40	0.018	0.04	0.98	9.45	6	0.150

df, degree of freedom; RMSEA, root mean square approximation; CFI, comparative fit index
^aLoadings, intercepts and residual variances of the five indicators, OH, QoL and FC, PA and FA, are constrained to be equal across the two time points; the mean of the latent variable is set to zero at t = 1 and freely estimated at t = 2
^bAfter removing the equality constraints between the PA loadings

ISSN: 1477-7525