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Table 6 Results of a multi-group factorial analysis assessing measurement and structural invariance of the CATI as a function of participant sex

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

Model χ2 df CFI RMSEA (90% CI) Δχ2 Δdf ΔCFI ΔRMSEA Decision
Configural Invariance 3937 1552 .989 .053 (.051–.055) Accept
Metric (weak) invariance 4293 1712 .988 .052 (.050–.054) 356 160 .001 − .001 Accept
Scalar (strong) invariance 5114 1754 .985 .059 (.057–.061) 821 42 .003 .007 Accept
Residual (strict) invariance 5464 1796 .983 .061 (.059–.063) 350 42 .002 .002 Accept
  1. ΔCFI > .01 and ΔRMSEA > .015 are indicative of a violation of the invariance assumption [49, 50]
  2. CFI comparative fit index, RMSEA root mean square error of approximation