Characterizing communicative development in children referred for autism spectrum disorders using the MacArthur-Bates Communicative Development Inventory (CDI).

Characterizing early communicative development in children with Autism Spectrum Disorders (ASD) is valuable for understanding profiles of ability in this population. The current investigation was modeled on Charman, Drew, Baird & Baird (2003b). Analyses explored parent report of early vocabulary, non-verbal communication, functional object use and play skills on the MacArthur-Bates Communicative Development Inventory (CDI) in 93 children with ASD, 31 children with developmental delay (DD) and 29 typically developing children. Results were generally consistent with those of Charman and colleagues (2003b), suggesting that skills improve with increasing non-verbal mental age and chronological age but that most children with ASD are delayed in receptive and expressive vocabulary and non-verbal communication, functional object use and play skills. Vocabulary profiles in the ASD sample were similar to those in the comparison samples, as was the developmental pattern of gesture and vocabulary mastery. However, when compared to published norms, children with ASD may show less of a discrepancy between their receptive and expressive vocabulary.