The Comprehensive Autistic Trait Inventory (CATI): development and validation of a new measure of autistic traits in the general population

Table 2 Robust fit indices obtained from confirmatory factor analyses of the data obtained in Study 2, and identical analyses for verification purposes using the data previously obtained in Study 1

	df	Confirmatory sample from Study 2					Exploratory sample from Study 1
	df	χ²	CFI	TLI	RMSEA	SRMR	χ²	CFI	TLI	RMSEA	SRMR
Simple correlated factors	804	5350.41	.915	.909	.071	.065	4535.54	.926	.921	.063	.057
One general factor	819	18,006.04	.679	.662	.137	.134	15,500.19	.708	.693	.124	.114
Two general factors: social and non-social	818	12,440.67	.783	.771	.113	.112	10,391.56	.810	.800	.100	.094
Hierarchical: single	813	5413.77	.914	.909	.071	.073	4961.78	.918	.913	.066	.065
Hierarchical: social and non-social	812	5091.82	.920	.915	.069	.069	4356.95	.930	.925	.061	.059
Bifactor: single	777	3582.16	.948	.942	.057	.058	3842.33	.939	.932	.058	.056
Bifactor: social and non-social	776	3172.37	.955	.950	.053	.054	31,843.67	.952	.947	.052	.050

The model with the best fit indices is highlighted in bold text
All chi-square tests significant: p < .001. CFI comparative fit index, TLI Tucker–Lewis Index, RMSEA root mean square error of approximation, SRMR standardised root-mean-square residual

ISSN: 2040-2392