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The Checklist for Autism in Young Children, comprising 30 symptoms related to autism, was administered to 143 children with autism. The children had an average of 23 (77%) of the checklist symptoms (range 50%—97%). Percentages of children exhibiting each checklist symptom and other data were compared with diagnostic criteria and associated features reported in the DSM-IV. Two DSM-IV diagnostic criteria were not supported by study findings, and four checklist symptoms occurred at high frequencies (89%—100%) but were not included as DSM-IV diagnostic criteria.
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Mayes et al. (1999) studied this question.
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