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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

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

  df Confirmatory sample from Study 2 Exploratory sample from Study 1
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
  1. The model with the best fit indices is highlighted in bold text
  2. 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