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Autism diagnostic interview: a standardized investigator-based instrument
A Le Couteur1, M Rutter, C Lord
1MRC Child Psychiatry Unit, Institute of Psychiatry, London, England.
Journal of Autism and Developmental Disorders
|September 1, 1989
Summary
A new interview and diagnostic algorithm aid in diagnosing pervasive developmental disorders. The ICD-10 algorithm demonstrated high reliability and accurately identified autistic individuals.
Area of Science:
- Psychiatry
- Developmental Psychology
- Clinical Diagnosis
Background:
- Pervasive developmental disorders (PDDs) require accurate differential diagnosis.
- Standardized assessment tools are crucial for reliable diagnosis.
Purpose of the Study:
- To develop and validate a standardized investigator-based interview for PDD differential diagnosis.
- To create a diagnostic algorithm based on ICD-10 criteria for PDD assessment.
Main Methods:
- Development of a novel standardized interview protocol.
- Creation of a diagnostic algorithm utilizing ICD-10 criteria.
- Interrater reliability testing with four raters across Canada and the UK on 32 videotaped interviews.
Main Results:
- The diagnostic algorithm demonstrated good interrater reliability.
- The interview items significantly discriminated between autistic and non-autistic subjects.
- The ICD-10 algorithm correctly identified all 16 autistic subjects and none of the 16 non-autistic subjects.
Conclusions:
- The developed interview and algorithm provide a reliable method for PDD diagnosis.
- The tool effectively differentiates autistic individuals within a mentally handicapped population.
- This standardized approach supports accurate differential diagnosis of pervasive developmental disorders.