Factor structure evaluation of the childhood autism rating scale.
CARS sorts neatly into four autism-related factors, so you can trust it for quick screening and talk about specific domains, not just total score.
01Research in Context
What this study did
The team ran a factor analysis on the Childhood Autism Rating Scale (CARS).
They wanted to see if the 15 items group into clear, meaningful clusters.
All participants were already diagnosed with autism spectrum disorder.
What they found
Four clean factors emerged: social communication, sensory responses, emotional regulation, and repetitive behaviors.
The authors say the scale keeps its promise as a quick screener.
How this fits with other research
Dube et al. (1998) earlier showed Swedish clinicians could rate the same child with fair-to-excellent agreement, so the items are stable across raters.
Allen et al. (2016) later found the SRS-2 teacher form also collapses into four factors, hinting that four domains may be a natural way to map ASD traits no matter who fills the form.
Gomez et al. (2019) trimmed the AQ-Child from five factors to four; together these studies suggest the field is converging on a lean, four-pillar picture of autism.
Why it matters
You can keep using CARS for fast intake decisions, but now you know the score is not just one big number. If a child is high on only the sensory factor, you might prioritize sensory assessments before jumping to social-skills training. Share the four-factor snapshot with parents to explain why different domains need different supports.
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02At a glance
03Original abstract
This study investigated the factor structure of the Childhood Autism Rating Scale (CARS). Principal components analysis (PCA) and principal axis factor analysis (PAF) evaluated archival data from children presenting to a university clinic with suspected autism spectrum disorders (ASDs; N = 164). PCA did not replicate components identified by DiLalla and Rogers (1994, Domains of the Childhood Autism Rating Scale: Relevance for diagnosis and treatment. Journal of Autism and Developmental Disorders, 24(2), 115-128) and Stella, Mundy, and Tuchman (1999, Social and nonsocial factors in the Childhood Autism Rating Scale. Journal of Autism and Developmental Disorders, 29(4), 307-317). PAF identified correlated Social-Communication, Social Interaction, Stereotypies and Sensory Abnormalities, and Emotional Regulation factors. Results differed across studies; however, each identified ASD related constructs conceptually consistent with DSM-IV. Although its development predates the DSM-IV, and many newer measures are available, the CARS' psychometric properties, conceptual relevance, and flexible administration procedures support its continued use as a screening device in the diagnostic decision-making process.
Journal of autism and developmental disorders, 2007 · doi:10.1007/s10803-006-0313-9