Structural equation analysis of a hypothesised symptom model in the autism spectrum
Article first published online: 10 MAR 2005
Journal of Child Psychology and Psychiatry
Volume 47, Issue 1, pages 37–44, January 2006
How to Cite
van Lang, N. D.J., Boomsma, A., Sytema, S., de Bildt, A. A., Kraijer, D. W., Ketelaars, C. and Minderaa, R. B. (2006), Structural equation analysis of a hypothesised symptom model in the autism spectrum. Journal of Child Psychology and Psychiatry, 47: 37–44. doi: 10.1111/j.1469-7610.2005.01434.x
- Issue published online: 10 MAR 2005
- Article first published online: 10 MAR 2005
- Manuscript accepted 16 November 2004
- Autism spectrum disorder;
- symptom structure;
- structural equation modelling
Background: Several studies showed a different symptom structure underlying the spectrum of autistic-like disorders from the behaviour triad as mentioned in the DSM-IV. In the present study, a hypothesised symptom model for autism was constructed, based on earlier explorative findings, and was put to a confirmatory test.
Method: Items from the Autism Diagnostic Interview-Revised (ADI-R) were used to examine the goodness of fit of the DSM-IV model, the hypothesised symptom model, and two additional models for autism. All models were tested in a group of 255 verbal and nonverbal individuals with minor to severe autistic symptomatology.
Results: The DSM-IV model encountered estimation problems. Conversely, the hypothesised symptom model had no such problems and proved to have a better fit to the sample data than the two additional models for autism. However, some of the observed variables were weak indicators of the three latent factors in the model.
Conclusions: The hypothesised symptom model appeared to be a plausible model in a group of individuals with a broad range of autistic behaviours and levels of functioning. Nevertheless, the stability of the model needs further examination in a larger group of individuals with disorders in the autism spectrum, and with varying degrees of intellectual functioning.