Aperçu: G.M.
La
recherche et la pratique dans le trouble du spectre de l'autisme (TSA)
reposent sur des mesures quantitatives, telles que l'échelle de
réactivité sociale (SRS), pour la caractérisation et le diagnostic. À
l'instar de nombreuses mesures diagnostiques du TSA, les scores SRS sont
influencés par des facteurs indépendants des caractéristiques
principales du TSA.
Cette étude interroge les propriétés psychométriques du SRS à
l'aide de la théorie des réponses aux items (IRT) et indique une
stratégie pour créer une forme sonore psychométriques rapide en
appliquant les résultats de l'IRT.
Les résultats ont identifié des éléments SRS spécifiques qui sont plus vulnérables aux traits non liés aux TSA .
La
forme courte de SRS à 16 éléments peut posséder des
propriétés psychométriques supérieures par rapport à l'échelle initiale
et émerger comme une mesure plus précise de la gravité des symptômes
principaux des TSA, en facilitant la recherche et la pratique.
Des recherches futures utilisant IRT sont nécessaires pour affiner les mesures existantes de la symptomatologie de l'autisme.
J Child Psychol Psychiatry. 2017 May 2. doi: 10.1111/jcpp.12731.
Development and validation of an item response theory-based Social Responsiveness Scale short form
Sturm A1, Kuhfeld M2, Kasari C3, McCracken JT1,4.
Author information
- 1
- Jane and Terry Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles (UCLA), Los Angeles, CA, USA.
- 2
- Population Research Center, The University of Texas at Austin, Austin, TX, USA.
- 3
- Center for Autism Research and Treatment, UCLA, Los Angeles, CA, USA.
- 4
- David Geffen School of Medicine, UCLA, Los Angeles, CA, USA.
Abstract
BACKGROUND:
Research and practice in autism spectrum disorder (ASD) rely on quantitative measures, such as the Social Responsiveness Scale (SRS), for characterization and diagnosis. Like many ASD diagnostic measures, SRS scores are influenced by factors unrelated to ASD core features. This study further interrogates the psychometric properties of the SRS using item response theory (IRT), and demonstrates a strategy to create a psychometrically sound short form by applying IRT results.METHODS:
Social Responsiveness Scale analyses were conducted on a large sample (N = 21,426) of youth from four ASD databases. Items were subjected to item factor analyses and evaluation of item bias by gender, age, expressive language level, behavior problems, and nonverbal IQ.RESULTS:
Item selection based on item psychometric properties, DIF analyses, and substantive validity produced a reduced item SRS short form that was unidimensional in structure, highly reliable (α = .96), and free of gender, age, expressive language, behavior problems, and nonverbal IQ influence. The short form also showed strong relationships with established measures of autism symptom severity (ADOS, ADI-R, Vineland). Degree of association between all measures varied as a function of expressive language.CONCLUSIONS:
Results identified specific SRS items that are more vulnerable to non-ASD-related traits. The resultant 16-item SRS short form may possess superior psychometric properties compared to the original scale and emerge as a more precise measure of ASD core symptom severity, facilitating research and practice. Future research using IRT is needed to further refine existing measures of autism symptomatology.
© 2017 Association for Child and Adolescent Mental Health.
- PMID: 28464350
- DOI: 10.1111/jcpp.12731
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