Detailed analysis of the Childhood Autism Spectrum Test CAST allows to differentiate clinical subtypes with difficulties in social communication

Detailed analysis of the Childhood Autism Spectrum Test CAST allows to differentiate clinical subtypes with difficulties in social communication

Main Article Content

Nerea Crespo Eguílaz
Leyre Gambra Echeverría
Borja Laña
Rocío Sánchez-Carpintero

Abstract

The Childhood Autism Spectrum Test-CAST (Scott et al., 2012) is a screening test for Asperger syndrome or autism spectrum disorder-grade 1 (ASD1). This study aims to analyze its different dimensions. Methodology: CAST was applied to 254 patients from the Neuropediatric Unit, aged 5 to 16 years, affected by: ASD1 (n = 17); social communication disorder (n = 43); procedural learning disorder (n = 60); attention-deficit/hyperactivity disorder (n = 44); intellectual disability (n = 30) and intellectual disability and epilepsy (n = 60). Results and discussion: with the traditional use of CAST in our clinical sample, 47.1% and 33.75% of false negatives and positives were obtained. A factor analysis of the 31 items of the questionnaire is carried out. A good fit of the data (KMO = 0.65 and MSA = 0.47-0.88), 7 factors are obtained, which explain 63% of the total variance. Reliability and validity are adequate. The discriminant analysis indicates that this new correction and interpretation allows classifying correctly 86.7% of the sample with or without difficulties in the social use of language. The most frequently altered dimensions in each clinical group are detailed. Conclusion: this analysis of CAST provides relevant information for the differential diagnosis of neurodevelopmental disorders.

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