Psychometric properties and measurement invariance of the Vaccination Attitudes Examination Scale (VAX) in a Spanish sample

Table 2 Measurement invariance by gender and by educational level models, and goodness-of-fit indices

	χ²	df	Δχ²	Δdf	CFI	RMSEA	SRMR	ΔCFI	ΔRMSEA	ΔSRMR
Gender
Men	64.45	48			0.980	0.048	0.044
Women	136.61*	48			0.949	0.069	0.050
Configural	200.98*	96	–	–	0.959	0.062	0.048	–	–	–
Metric	203.69*	104	10.6	8	0.961	0.058	0.053	0.002	− 0.004	0.005
Scalar	230.02*	112	20.0	8	0.946	0.061	0.057	− 0.015	0.003	0.004
Educational level
Up to higher education	116.88*	48			0.958	0.063	0.053
With university studies	93.04*	48			0.950	0.066	0.046
Configural	210.28*	96	–	–	0.955	0.064	0.050	–	–	–
Metric	217.48*	104	7.2	8	0.955	0.061	0.057	0	− 0.003	0.007
Scalar	233.89*	112	16.41	8	0.952	0.061	0.060	− 0.003	0	0.003

The change value that exceeds the invariance recommendations has been bolded
Reference group for Gender: Men. Reference group for Educational Level: Up to higher education
Δχ² = chi-square change; Δdf = degrees of freedom change; CFI = Comparative Fit Index; RMSEA = Root-Mean-Square Error of Approximation; SRMR = Standardized-Root-Mean Square Residual; ΔCFI = CFI change; ΔRMSEA = RMSEA change; ΔSRMR = SRMR change. The change value that exceeds the invariance recommendations has been bolded. *p < 0.001

ISSN: 2050-7283