Adaptive behavior in autism and Pervasive Developmental Disorder-Not Otherwise Specified: microanalysis of scores on the Vineland Adaptive Behavior Scales.
Zoom in on Vineland expressive elaboration items—they cleanly separate autism from PDD-NOS in kids with mild-moderate ID.
01Research in Context
What this study did
Rhea and colleagues looked at Vineland Adaptive Behavior Scales item-by-item.
They wanted to see which tiny language details separate autism from PDD-NOS.
All kids had mild to moderate intellectual disability and were early elementary age.
What they found
Three expressive communication sub-scores got it right 80 percent of the time.
These sub-scores check syntax, morphology, and how language is used socially.
Other Vineland domains showed almost no difference between the two groups.
How this fits with other research
Fenton et al. (2003) seems to disagree. They found no unique Vineland profile when kids had moderate or severe delay across diagnoses. The key difference: Gemma’s broader delay masked the small language gaps that Rhea caught.
Cappagli et al. (2016) extends the idea downward. They showed that in low-functioning preschoolers, different Vineland subsets (Playing, Following instructions, Beginning to talk, Speech skills) separate ASD from other disorders.
Mouga et al. (2015) later confirmed that socialization stays the weakest domain for autistic kids even after matching IQ, backing the social-language link Rhea highlighted.
Why it matters
When you score a Vineland, flip to the expressive elaboration items first. If syntax, morphology, and pragmatic use are low compared to other scores, flag autism over PDD-NOS. This quick check can sharpen your differential diagnosis without extra tests.
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02At a glance
03Original abstract
The purpose of this study is to provide a microanalysis of differences in adaptive functioning seen between well-matched groups of school-aged children with autism and those diagnosed as having Pervasive Developmental Disorder-Not Otherwise Specified, all of whom functioned in the mild to moderate range of intellectual impairment. Findings indicate that the major area of difference between children with autism and those with Pervasive Developmental Disorder-Not Otherwise Specified, was expressive communication; specifically, the use of elaborations in syntax and morphology and in pragmatic use of language to convey and to seek information in discourse. Linear discriminant function analysis revealed that scores on just three of these expressive communication item sets correctly identified subjects in the two diagnostic categories with 80% overall accuracy. Implications of these findings for both diagnosis and intervention with children with Autism Spectrum Disorders will be discussed.
Journal of autism and developmental disorders, 2004 · doi:10.1023/b:jadd.0000022612.18116.46