Psychometric validation and refinement of the Interoception Sensory Questionnaire (ISQ) in adolescents and adults on the autism spectrum

Table 3 Fit indices for original and revised ISQ confirmatory factor models

ISQ Version	χ2	df	p value	CFI_cML	TLI_cML	RMSEA_cML [90% CI]	SRMR_u [90% CI]	CRMR_u [90% CI]	WRMR	ω
ISQ-20	1536.18	170	< 0.001	0.838	0.819	0.141 [0.135, 0.148]	0.057 [0.049, 0.061]	0.058 [0.052, 0.064]	1.765	0.966
ISQ-8	46.30	20	0.007	0.984	0.977	0.063 [0.042, 0.085]	0.019 [0.012, 0.025]	0.021 [0.014, 0.028]	0.499	0.901

χ² based on limited-information WLSMV estimator. Values in bold exceed standard fit index cutoffs
CFI_cML, comparative fit index (based on categorical maximum likelihood estimator); TLI_cML, Tucker-Lewis index (based on categorical maximum likelihood estimator); RMSEA_cML, root mean square error of approximation (based on categorical maximum likelihood estimator); SRMR_u, standardized root mean square residual (unbiased estimator); CRMR_u, correlation root mean square residual (unbiased estimator); WRMR, weighted root mean square residual; ω, coefficient omega (internal consistency reliability)

ISSN: 2040-2392