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Table 4 Fit indices and model comparisons of the non-social traits of autism (Adult Routines Inventory, Sensory Perception Quotient short, Autism Spectrum Quotient short)

From: Evaluating the latent structure of the non-social domain of autism in autistic adults

Model Description Fit indices
RMSEA CFI TLI χ2
Non-social model     
1 Four-factor DSM-5 model 0.031 0.994 0.989 37.943**
2 One-factor non-social model 0.139 0.858 0.786 238.902**
3 Two-factor RMS and IS model A (restricted interests loading onto RMS factor) 0.090 0.944 0.910 100.910**
4 Two-factor RMS and IS model B (restricted interests loading onto IS factor) 0.107 0.921 0.872 137.767**
5 Three-factor model RMS, IS and restricted interests (RI) loading onto a separate factor 0.077 0.965 0.934 65.610**
  1. Note. RMSEA, root mean square error of approximation; CFI, comparative fit index; TLI, Tucker–Lewis index; χ2, Chi-square statistic
  2. ** p < 0.01