Are Autistic Traits Measured Equivalently in Individuals With and Without An Autism Spectrum Disorder? An Invariance Analysis of the Autism Spectrum Quotient Short Form / Aja L. MURRAY in Journal of Autism and Developmental Disorders, 44-1 (January 2014)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 44-1 (January 2014) . - p.55-64 Titre : Are Autistic Traits Measured Equivalently in Individuals With and Without An Autism Spectrum Disorder? An Invariance Analysis of the Autism Spectrum Quotient Short Form Type de document : Texte imprimé et/ou numérique Auteurs : Aja L. MURRAY, Auteur ; Tom BOOTH, Auteur ; Karen MCKENZIE, Auteur ; Renate KUENSSBERG, Auteur ; Michael O’DONNELL, Auteur Article en page(s) : p.55-64 Langues : Anglais (eng) Mots-clés : Autism  Autistic traits  Measurement invariance  Confirmatory factor analysis  Autism spectrum quotient Index. décimale : PER Périodiques Résumé : It is common to administer measures of autistic traits to those without autism spectrum disorders (ASDs) with, for example, the aim of understanding autistic personality characteristics in non-autistic individuals. Little research has examined the extent to which measures of autistic traits actually measure the same traits in the same way across those with and without an ASD. We addressed this question using a multi-group confirmatory factor invariance analysis of the Autism Quotient Short Form (AQ-S: Hoekstra et al. in J Autism Dev Disord 41(5):589–596, 2011) across those with (n = 148) and without (n = 168) ASD. Metric variance (equality of factor loadings), but not scalar invariance (equality of thresholds), held suggesting that the AQ-S measures the same latent traits in both groups, but with a bias in the manner in which trait levels are estimated. We, therefore, argue that the AQ-S can be used to investigate possible causes and consequences of autistic traits in both groups separately, but caution is due when combining or comparing levels of autistic traits across the two groups. En ligne : http://dx.doi.org/10.1007/s10803-013-1851-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=220 [article] Are Autistic Traits Measured Equivalently in Individuals With and Without An Autism Spectrum Disorder? An Invariance Analysis of the Autism Spectrum Quotient Short Form [Texte imprimé et/ou numérique] / Aja L. MURRAY, Auteur ; Tom BOOTH, Auteur ; Karen MCKENZIE, Auteur ; Renate KUENSSBERG, Auteur ; Michael O’DONNELL, Auteur . - p.55-64. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 44-1 (January 2014) . - p.55-64 Mots-clés : Autism  Autistic traits  Measurement invariance  Confirmatory factor analysis  Autism spectrum quotient Index. décimale : PER Périodiques Résumé : It is common to administer measures of autistic traits to those without autism spectrum disorders (ASDs) with, for example, the aim of understanding autistic personality characteristics in non-autistic individuals. Little research has examined the extent to which measures of autistic traits actually measure the same traits in the same way across those with and without an ASD. We addressed this question using a multi-group confirmatory factor invariance analysis of the Autism Quotient Short Form (AQ-S: Hoekstra et al. in J Autism Dev Disord 41(5):589–596, 2011) across those with (n = 148) and without (n = 168) ASD. Metric variance (equality of factor loadings), but not scalar invariance (equality of thresholds), held suggesting that the AQ-S measures the same latent traits in both groups, but with a bias in the manner in which trait levels are estimated. We, therefore, argue that the AQ-S can be used to investigate possible causes and consequences of autistic traits in both groups separately, but caution is due when combining or comparing levels of autistic traits across the two groups. En ligne : http://dx.doi.org/10.1007/s10803-013-1851-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=220

Are We Under-Estimating the Association Between Autism Symptoms?: The Importance of Considering Simultaneous Selection When Using Samples of Individuals Who Meet Diagnostic Criteria for an Autism Spectrum Disorder / Aja Louise MURRAY in Journal of Autism and Developmental Disorders, 44-11 (November 2014)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 44-11 (November 2014) . - p.2921-2930 Titre : Are We Under-Estimating the Association Between Autism Symptoms?: The Importance of Considering Simultaneous Selection When Using Samples of Individuals Who Meet Diagnostic Criteria for an Autism Spectrum Disorder Type de document : Texte imprimé et/ou numérique Auteurs : Aja Louise MURRAY, Auteur ; Karen MCKENZIE, Auteur ; Renate KUENSSBERG, Auteur ; Michael O’DONNELL, Auteur Article en page(s) : p.2921-2930 Langues : Anglais (eng) Mots-clés : Autism spectrum disorder  Range restriction  Fractionable triad  Simultaneous selection  Sampling Index. décimale : PER Périodiques Résumé : The magnitude of symptom inter-correlations in diagnosed individuals has contributed to the evidence that autism spectrum disorders (ASD) is a fractionable disorder. Such correlations may substantially under-estimate the population correlations among symptoms due to simultaneous selection on the areas of deficit required for diagnosis. Using statistical simulations of this selection mechanism, we provide estimates of the extent of this bias, given different levels of population correlation between symptoms. We then use real data to compare domain inter-correlations in the Autism Spectrum Quotient, in those with ASD versus a combined ASD and non-ASD sample. Results from both studies indicate that samples restricted to individuals with a diagnosis of ASD potentially substantially under-estimate the magnitude of association between features of ASD. En ligne : http://dx.doi.org/10.1007/s10803-014-2154-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=241 [article] Are We Under-Estimating the Association Between Autism Symptoms?: The Importance of Considering Simultaneous Selection When Using Samples of Individuals Who Meet Diagnostic Criteria for an Autism Spectrum Disorder [Texte imprimé et/ou numérique] / Aja Louise MURRAY, Auteur ; Karen MCKENZIE, Auteur ; Renate KUENSSBERG, Auteur ; Michael O’DONNELL, Auteur . - p.2921-2930. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 44-11 (November 2014) . - p.2921-2930 Mots-clés : Autism spectrum disorder  Range restriction  Fractionable triad  Simultaneous selection  Sampling Index. décimale : PER Périodiques Résumé : The magnitude of symptom inter-correlations in diagnosed individuals has contributed to the evidence that autism spectrum disorders (ASD) is a fractionable disorder. Such correlations may substantially under-estimate the population correlations among symptoms due to simultaneous selection on the areas of deficit required for diagnosis. Using statistical simulations of this selection mechanism, we provide estimates of the extent of this bias, given different levels of population correlation between symptoms. We then use real data to compare domain inter-correlations in the Autism Spectrum Quotient, in those with ASD versus a combined ASD and non-ASD sample. Results from both studies indicate that samples restricted to individuals with a diagnosis of ASD potentially substantially under-estimate the magnitude of association between features of ASD. En ligne : http://dx.doi.org/10.1007/s10803-014-2154-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=241

Brief Report: An Evaluation of the AQ-10 as a Brief Screening Instrument for ASD in Adults / Tom BOOTH in Journal of Autism and Developmental Disorders, 43-12 (December 2013)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 43-12 (December 2013) . - p.2997-3000 Titre : Brief Report: An Evaluation of the AQ-10 as a Brief Screening Instrument for ASD in Adults Type de document : Texte imprimé et/ou numérique Auteurs : Tom BOOTH, Auteur ; Aja Louise MURRAY, Auteur ; Karen MCKENZIE, Auteur ; Renate KUENSSBERG, Auteur ; Michael O’DONNELL, Auteur ; Hollie G. BURNETT, Auteur Article en page(s) : p.2997-3000 Langues : Anglais (eng) Mots-clés : Autism  AQ  ASD  Screening  ROC analysis Index. décimale : PER Périodiques Résumé : There is a need for brief screening instruments for autistic spectrum disorders (ASD) that can be used by frontline healthcare professionals to aid in the decision as to whether an individual should be referred for a full diagnostic assessment. In this study we evaluated the ability of a short form of the autism spectrum quotient (AQ) questionnaire, the 10 item AQ-10, to correctly classify individuals as having or not having ASD. In a sample of 149 individuals with ASD and 134 controls without an ASD diagnosis, we found that the full AQ (AQ-50) abridged AQ (AQ-S) and AQ-10 all performed well as a screen for ASD. ROC analysis indicated that sensitivity, specificity and area under the curve were very similar at suggested cut-off’s for ASD across measures, with little difference in performance between the AQ-10 and full AQ-50. Results indicate the potential usefulness of the AQ-10 as a brief screen for ASD. En ligne : http://dx.doi.org/10.1007/s10803-013-1844-5 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=218 [article] Brief Report: An Evaluation of the AQ-10 as a Brief Screening Instrument for ASD in Adults [Texte imprimé et/ou numérique] / Tom BOOTH, Auteur ; Aja Louise MURRAY, Auteur ; Karen MCKENZIE, Auteur ; Renate KUENSSBERG, Auteur ; Michael O’DONNELL, Auteur ; Hollie G. BURNETT, Auteur . - p.2997-3000. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 43-12 (December 2013) . - p.2997-3000 Mots-clés : Autism  AQ  ASD  Screening  ROC analysis Index. décimale : PER Périodiques Résumé : There is a need for brief screening instruments for autistic spectrum disorders (ASD) that can be used by frontline healthcare professionals to aid in the decision as to whether an individual should be referred for a full diagnostic assessment. In this study we evaluated the ability of a short form of the autism spectrum quotient (AQ) questionnaire, the 10 item AQ-10, to correctly classify individuals as having or not having ASD. In a sample of 149 individuals with ASD and 134 controls without an ASD diagnosis, we found that the full AQ (AQ-50) abridged AQ (AQ-S) and AQ-10 all performed well as a screen for ASD. ROC analysis indicated that sensitivity, specificity and area under the curve were very similar at suggested cut-off’s for ASD across measures, with little difference in performance between the AQ-10 and full AQ-50. Results indicate the potential usefulness of the AQ-10 as a brief screen for ASD. En ligne : http://dx.doi.org/10.1007/s10803-013-1844-5 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=218

Structural validation of the abridged Autism Spectrum Quotient–Short Form in a clinical sample of people with autism spectrum disorders / Renate KUENSSBERG in Autism, 18-2 (February 2014)  

Public ISBD [article]  inAutism > 18-2 (February 2014) . - p.69-75 Titre : Structural validation of the abridged Autism Spectrum Quotient–Short Form in a clinical sample of people with autism spectrum disorders Type de document : Texte imprimé et/ou numérique Auteurs : Renate KUENSSBERG, Auteur ; Aja L. MURRAY, Auteur ; Tom BOOTH, Auteur ; Karen MCKENZIE, Auteur Article en page(s) : p.69-75 Langues : Anglais (eng) Mots-clés : Autism Spectrum Quotient  confirmatory factor analysis  psychometric evaluation Index. décimale : PER Périodiques Résumé : The primary aim of this article was to provide a structural validation of the 28-item Autism Spectrum Quotient–Short Form questionnaire in a sample of adults with clinically diagnosed autism spectrum disorders (n = 148). Confirmatory factor analysis demonstrated that the proposed structure, comprising a second-order Social Skills factor subsuming first-order factors of Social Skills, Routine, Switching and Imagination, and a Numbers/Patterns factor showed good acceptable fit to the data (? 2 = 464.27(345), p .05; comparative fit index = .91; Tucker Lewis index = .90; root mean squared error of approximation = .048; weighted root mean square residual = 0.98). Summed mean scores for the total sample, and males and females separately, showed no significant differences to previously reported means, with the exception of Numbers/Patterns, for which the current sample reported significantly lower means in both males (t = 3.37, p 0.001) and females (t = 2.33, p 0.05). The results provide support for both the proposed structure of the AQ-S and the stability of total and subscale mean scores in different samples of participants with autism spectrum disorder diagnoses. En ligne : http://dx.doi.org/10.1177/1362361312467708 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=223 [article] Structural validation of the abridged Autism Spectrum Quotient–Short Form in a clinical sample of people with autism spectrum disorders [Texte imprimé et/ou numérique] / Renate KUENSSBERG, Auteur ; Aja L. MURRAY, Auteur ; Tom BOOTH, Auteur ; Karen MCKENZIE, Auteur . - p.69-75. Langues : Anglais (eng) in Autism > 18-2 (February 2014) . - p.69-75 Mots-clés : Autism Spectrum Quotient  confirmatory factor analysis  psychometric evaluation Index. décimale : PER Périodiques Résumé : The primary aim of this article was to provide a structural validation of the 28-item Autism Spectrum Quotient–Short Form questionnaire in a sample of adults with clinically diagnosed autism spectrum disorders (n = 148). Confirmatory factor analysis demonstrated that the proposed structure, comprising a second-order Social Skills factor subsuming first-order factors of Social Skills, Routine, Switching and Imagination, and a Numbers/Patterns factor showed good acceptable fit to the data (? 2 = 464.27(345), p .05; comparative fit index = .91; Tucker Lewis index = .90; root mean squared error of approximation = .048; weighted root mean square residual = 0.98). Summed mean scores for the total sample, and males and females separately, showed no significant differences to previously reported means, with the exception of Numbers/Patterns, for which the current sample reported significantly lower means in both males (t = 3.37, p 0.001) and females (t = 2.33, p 0.05). The results provide support for both the proposed structure of the AQ-S and the stability of total and subscale mean scores in different samples of participants with autism spectrum disorder diagnoses. En ligne : http://dx.doi.org/10.1177/1362361312467708 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=223

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