The Parent Interview for Autism-Clinical Version (PIA-CV) was developed to measure autism symptom severity across a wide range of behavioral domains. Two studies were conducted to examine the psychometric properties of the PIA-CV for a sample of children under 3 years old. Results of study 1 revealed adequate internal consistency for nine of the 11 PIA-CV dimensions, as well as significant group differences on social-communication domains between 2-year-old children with autism and a developmentally matched sample. Study 2 examined the association between changes in PIA-CV scores and changes in autism symptomatology from age 2 to age 4. Results revealed that changes on PIA-CV dimensions assessing social and communication skills were associated with clinically significant behavioral and diagnostic improvements. These findings support the utility of the PIA-CV for obtaining ecologically valid information from parents and for measuring behavioral change in young children with autism.
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Stone et al. (2003) studied this question.