Measurement invariance and adapted preferences: evidence for the ICECAP-A and WeRFree instruments

Table 2 Measurement invariance of the WeRFree instrument per subsample

Subsample	Model	Χ² (df)	CFI	RMSEA (90% CI)	SRMR	Δ Χ² (Δ df)	Δ CFI	Δ RMSEA	Δ SRMR
Health condition	Configural invariance	2990.14 (696)	0.961	0.058 (0.056–0.060)	0.041	-	-	-	-
	Metric invariance	3257.81 (780)	0.958	0.057 (0.055–0.059)	0.049	267.67 (84)	-0.003	-0.001	0.008
	Scalar invariance	3916.75 (864)	0.948	0.060 (0.058–0.062)	0.052	658.93 (84)	-0.010	0.003	0.003
	Residual invariance	7233.82 (969)	0.893	0.081 (0.079–0.082)	0.081	3317.08 (105)	-0.055	0.021	0.029
Age	Configural invariance	2853.83 (522)	0.966	0.058 (0.056–0.060)	0.039	-	-	-	-
	Metric invariance	3004.33 (582)	0.965	0.056 (0.054–0.058)	0.043	150.50 (60)	-0.001	-0.002	0.004
	Scalar invariance	3669.88 (642)	0.956	0.059 (0.057–0.061)	0.047	665.54 (60)	-0.009	0.004	0.004
	Residual invariance	4465.45 (717)	0.945	0.062 (0.061–0.064)	0.051	795.58 (75)	-0.011	0.003	0.004
Gender	Configural invariance	2367.76 (174)	0.969	0.056 (0.054–0.058)	0.036	-	-	-	-
	Metric invariance	2399.61 (186)	0.969	0.054 (0.052–0.056)	0.037	31.84 (12)	-0.000	-0.002	0.001
	Scalar invariance	2705.98 (198)	0.965	0.056 (0.054–0.058)	0.039	306.37 (12)	-0.004	0.002	0.002
	Residual invariance	3028.31 (213)	0.960	0.057 (0.056–0.059)	0.041	322.33 (15)	-0.004	0.001	0.002
Education	Configural invariance	2498.27 (261)	0.968	0.053 (0.055–0.059)	0.037	-	-	-	-
	Metric invariance	2565.40 (285)	0.968	0.055 (0.053–0.057)	0.039	67.13 (24)	-0.001	-0.002	0.002
	Scalar invariance	2678.03 (309)	0.966	0.054 (0.052–0.055)	0.040	112.63 (24)	-0.001	-0.001	0.001
	Residual invariance	3236.31 (339)	0.959	0.057 (0.055–0.058)	0.042	558.29 (30)	-0.008	0.003	0.002

Chi-score (Χ), Comparative Fit Index (CFI), Degrees of freedom (df), Root Mean Squared Error of Approximation (RMSEA) with 90% Confidence Intervals (CI), Standardized Root Mean Residual (SRMR).

ISSN: 1477-7525