Abstract
We aimed to construct and validate a shortened form of the developmental, diagnostic and dimensional interview (3Di), a parent report interview for assessing and diagnosing autistic spectrum disorders (ASDs). Data from 879 children and young people were used. In half of the sample (n = 440) reliability analysis was used to identify 3Di items that best measured each dimension of the autism triad. This informed the construction of a shortened (53 item) 3Di, which was then validated on subjects not used in the reliability analysis (n = 439). This involved comparison with scores from the original 3Di algorithm and, in a subsample (n = 29), with the autism diagnostic interview-revised (ADI-R). Agreement of the new shortened 3Di with the 3Di’s original algorithm was excellent in both dimensional and categorical terms. Agreement on caseness (27 out of 29) with the ADI-R was also strong. The new 3Di short version is less than half as long as the original version and outputs very similar scores. It will be useful to clinicians and researchers for obtaining a dimensional autism assessment in less than 45 minutes.
Notes
Plus a further five questions about the age that particular milestones were reached. These are used to distinguish between disorders on the autistic spectrum.
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Acknowledgment
The authors thank the children and families who participated in data collection.
Conflict of interest statement
Dr. Skuse and Mr. Warrington are stockholders in IXDX Ltd., which owns exclusive rights to the interview software and the dissemination of 3Di technology and intellectual property.
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Santosh, P.J., Mandy, W.P.L., Puura, K. et al. The construction and validation of a short form of the developmental, diagnostic and dimensional interview. Eur Child Adolesc Psychiatry 18, 521–524 (2009). https://doi.org/10.1007/s00787-009-0004-0
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DOI: https://doi.org/10.1007/s00787-009-0004-0