Using the big data approach to clarify the structure of restricted and repetitive behaviors across the most commonly used autism spectrum disorder measures

Table 2 Summary of goodness of fit statistics for the tested factor analysis models

Model		χ²	CFI	TLI	RMSEA	SRMR
SCQ
EFA Unidimensional	Sample 1	577.668**	.903	.871	.071**	.069
EFA 2-Factor	Sample 1	132.470**	.980	.962	.039**	.030
EFA 3-Factor	Sample 1	16.176	.999	.998	.009	.011
ESEM 3-Factor	Sample 2	34.903**	.995	.986	.022	.016
	Female Sex/gender	17.098	.997	.992	.017	.017
	Male Sex/gender	29.386*	.998	.994	.015	.011
	Age group 1^a	42.884**	.997	.990	.019	.013
	Age group 2^b	43.648*	.996	.988	.021	.015
	Age group 3^c	30.61**	.995	.984	.026	.020
SRS-2
EFA Unidimensional	Sample 1	3796.694**	.825	.754	.150**	.070
EFA 2-Factor	Sample 1	1374.531**	.937	.864	.112**	.034
EFA 3-Factor	Sample 1	23.619**	.999	.997	.017	.004
ESEM 3-Factor	Sample 2	21.284**	.999	.997	.016	.004
	Female Sex/gender	27.201**	.998	.992	.031	.006
	Male Sex/gender	28.311**	.999	.997	.015	.003
	Age group 1^a	13.131	.999	.998	.014	.004
	Age group 2^b	48.439**	.999	.995	.027	.005
	Age group 3^c	3.44	.999	.998	.008	.003
ADI-R
Current scores
EFA Unidimensional	Sample 1	1951.781**	.708	.643	.091**	.086
EFA 2-Factor	Sample 1	219.452**	.973	.958	.031	.029
EFA 3-Factor	Sample 1	142.231**	.983	.966	.028	.024
ESEM 3-Factor	Sample 2	84.499**	.991	.980	.024	.003
	Female Sex/gender	36.983	.996	.991	.017	.020
	Male Sex/gender	137.23**	.988	.974	.026	.019
	Age group 1^a	107.986**	.983	.962	.031	.023
	Age group 2^b	32.346	.997	.994	.013	.019
	Age group 3^c	28.838	.998	.996	.011	.020
ADOS Modules 3 and 4
EFA unidimensional	Sample 1	44.137**	.915	.756	.083	.035
	Sample 2	42.256**	.930	.780	.082	.035

ADI-R, Autism Diagnostic Interview-Revised; CFA, Confirmatory Factor; CFI, Comparative Fit Index; ESEM, Exploratory Structural Equation Modeling; RMSEA, Root Mean Square Error of Approximation; SCQ, Social Communication Questionnaire; SRMR, Standardized Root Mean Square Residual; SRS-2, Social Responsiveness Scale; TLI, Tucker-Lewis Index
*p < .01; **p < .001
^aAge Group 1: 2–6 years; ^bAge Group 2: 7–12 years; ^cAge Group 3: 13 years and above

ISSN: 2040-2392