A new symptom model for autism cross-validated in an independent sample / Anne BOOMSMA in Journal of Child Psychology and Psychiatry, 49-8 (August 2008)  

Public ISBD [article]  inJournal of Child Psychology and Psychiatry > 49-8 (August 2008) . - p.809 - 816 Titre : A new symptom model for autism cross-validated in an independent sample Type de document : Texte imprimé et/ou numérique Auteurs : Anne BOOMSMA, Auteur ; Natasja D.J. VAN LANG, Auteur ; Annelies A. DE BILDT, Auteur ; Ruud B. MINDERAA, Auteur ; Herman VAN ENGELAND, Auteur ; Maretha V. DE JONGE, Auteur Année de publication : 2008 Article en page(s) : p.809 - 816 Langues : Anglais (eng) Mots-clés : Autism-spectrum-disorder symptom-model cross-validation Index. décimale : PER Périodiques Résumé : Background: Results from several studies indicated that a symptom model other than the DSM triad might better describe symptom domains of autism. The present study focused on a) investigating the stability of a new symptom model for autism by cross-validating it in an independent sample and b) examining the invariance of the model regarding three covariates: symptom severity, intelligence, and age. Method: The validity of the symptom model was examined in an independent sample of N = 263 children and adolescents with autism spectrum disorders, and model invariance was studied in a larger sample of N = 356 children and adolescents with autism spectrum disorders. The fit of the symptom model to the sample data was compared to that of alternative models (including the DSM triad), and the invariance of the new model was investigated for each covariate by multiple-group comparisons. Results: The fit of the new symptom model was better than that of two alternative models. It could not be compared to that of the DSM triad, because the latter encountered empirical identification problems. There were no significant or substantive differences between the estimated model in each of the dichotomised groups for any of the three covariates, which indicated factorial invariance of both structural form and factor loadings. Conclusions: The symptom model appeared to be relatively stable: It could be cross-validated in the independent sample and factorial invariance was shown between the dichotomised groups for each covariate. Further model validation with instruments other than the Autism Diagnostic Interview-Revised (ADI-R) is recommended. En ligne : http://dx.doi.org/10.1111/j.1469-7610.2008.01897.x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=541 [article] A new symptom model for autism cross-validated in an independent sample [Texte imprimé et/ou numérique] / Anne BOOMSMA, Auteur ; Natasja D.J. VAN LANG, Auteur ; Annelies A. DE BILDT, Auteur ; Ruud B. MINDERAA, Auteur ; Herman VAN ENGELAND, Auteur ; Maretha V. DE JONGE, Auteur . - 2008 . - p.809 - 816. Langues : Anglais (eng) in Journal of Child Psychology and Psychiatry > 49-8 (August 2008) . - p.809 - 816 Mots-clés : Autism-spectrum-disorder symptom-model cross-validation Index. décimale : PER Périodiques Résumé : Background: Results from several studies indicated that a symptom model other than the DSM triad might better describe symptom domains of autism. The present study focused on a) investigating the stability of a new symptom model for autism by cross-validating it in an independent sample and b) examining the invariance of the model regarding three covariates: symptom severity, intelligence, and age. Method: The validity of the symptom model was examined in an independent sample of N = 263 children and adolescents with autism spectrum disorders, and model invariance was studied in a larger sample of N = 356 children and adolescents with autism spectrum disorders. The fit of the symptom model to the sample data was compared to that of alternative models (including the DSM triad), and the invariance of the new model was investigated for each covariate by multiple-group comparisons. Results: The fit of the new symptom model was better than that of two alternative models. It could not be compared to that of the DSM triad, because the latter encountered empirical identification problems. There were no significant or substantive differences between the estimated model in each of the dichotomised groups for any of the three covariates, which indicated factorial invariance of both structural form and factor loadings. Conclusions: The symptom model appeared to be relatively stable: It could be cross-validated in the independent sample and factorial invariance was shown between the dichotomised groups for each covariate. Further model validation with instruments other than the Autism Diagnostic Interview-Revised (ADI-R) is recommended. En ligne : http://dx.doi.org/10.1111/j.1469-7610.2008.01897.x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=541

Structural equation analysis of a hypothesised symptom model in the autism spectrum / Natasja D.J. VAN LANG in Journal of Child Psychology and Psychiatry, 47-1 (January 2006)  

Public ISBD [article]  inJournal of Child Psychology and Psychiatry > 47-1 (January 2006) . - p.37–44 Titre : Structural equation analysis of a hypothesised symptom model in the autism spectrum Type de document : Texte imprimé et/ou numérique Auteurs : Natasja D.J. VAN LANG, Auteur ; Anne BOOMSMA, Auteur ; Sjoerd SYTEMA, Auteur ; Annelies A. DE BILDT, Auteur ; Dirk W. KRAIJER, Auteur ; Cees KETELAARS, Auteur ; Ruud B. MINDERAA, Auteur Année de publication : 2006 Article en page(s) : p.37–44 Langues : Anglais (eng) Mots-clés : Autism-spectrum-disorder symptom-structure structural-equation-modelling Index. décimale : PER Périodiques Résumé : 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. En ligne : http://dx.doi.org/10.1111/j.1469-7610.2005.01434.x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=701 [article] Structural equation analysis of a hypothesised symptom model in the autism spectrum [Texte imprimé et/ou numérique] / Natasja D.J. VAN LANG, Auteur ; Anne BOOMSMA, Auteur ; Sjoerd SYTEMA, Auteur ; Annelies A. DE BILDT, Auteur ; Dirk W. KRAIJER, Auteur ; Cees KETELAARS, Auteur ; Ruud B. MINDERAA, Auteur . - 2006 . - p.37–44. Langues : Anglais (eng) in Journal of Child Psychology and Psychiatry > 47-1 (January 2006) . - p.37–44 Mots-clés : Autism-spectrum-disorder symptom-structure structural-equation-modelling Index. décimale : PER Périodiques Résumé : 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. En ligne : http://dx.doi.org/10.1111/j.1469-7610.2005.01434.x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=701

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