Abstract
This study explored regression patterns in 100 children with ASD (3-11years) using several approaches to enhance the validity of retrospective parent report. Both early development and outcome were examined in regression groups defined by 36months age cut-off and two underlying empirical patterns based on type and onset age. Results over regression groups were generally consistent. During early development, children with regression showed a similar amount of social atypicalities and stereotyped behaviour as compared to children without regression. However, parents indicated less communication skills which could be a valuable predictor of regression. Development after regression was characterised by early language delay and more restricted and repetitive behaviour. The findings provide insight into the diagnosis and prognosis of regression in ASD.
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