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Stability of the ADI-R

Abstract

This study examined the stability of scores on the ADI-R from pre-school to elementary school age in
children with autism spectrum disorders (ASD). Participants were 35 children who, at T1, all had a
clinical diagnosis of ASD. On initial assessment (mean age 3.5 years; SD 0.6), all met ADI-R
algorithm criteria for autism. ADI-R assessments were repeated at follow up (FU; mean age 10.5 years;
SD 0.8). Changes in ADI-R total, domain and ADI-R algorithm item scores were assessed. Twenty-
eight children continued to score above the ADI-R cut-off for autism at FU, although significant
decreases in ADI-R domain and item scores were also found. In conclusion, while classification of
children according to ADI-R criteria, generally remained stable between pre-school and elementary
school age, many children demonstrated significant improvements in symptom severity.

Key words: Autism Diagnostic Interview-Revised, autism spectrum disorder, autism, longitudinal
study, symptom severity.

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