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Journal of Autism and Developmental Disorders

Gepubliceerd in:

01-07-2008 | Original Paper

Trends in Autism Prevalence: Diagnostic Substitution Revisited

Auteurs: Helen Coo, Hélène Ouellette-Kuntz, Jennifer E. V. Lloyd, Liza Kasmara, Jeanette J. A. Holden, M. E. Suzanne Lewis

Gepubliceerd in: Journal of Autism and Developmental Disorders | Uitgave 6/2008

Abstract

There has been little evidence to support the hypothesis that diagnostic substitution may contribute to increases in the administrative prevalence of autism. We examined trends in assignment of special education codes to British Columbia (BC) school children who had an autism code in at least 1 year between 1996 and 2004, inclusive. The proportion of children with an autism code increased from 12.3/10,000 in 1996 to 43.1/10,000 in 2004; 51.9% of this increase was attributable to children switching from another special education classification to autism (16.0/10,000). Taking into account the reverse situation (children with an autism code switching to another special education category (5.9/10.000)), diagnostic substitution accounted for at least one-third of the increase in autism prevalence over the study period.

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Generally, children in British Columbia are required to enroll in an educational program “…on the first day of a school year if, on or before December 31 of that school year, the person will have reached the age of 5 years.” However, parents may opt to defer enrollment of their child until the first school day of the next school year (British Columbia Ministry of Education 2006b). Accordingly, we considered a child to be at the age of mandatory school enrolment if he or she was 6 years of age or under as of December 31, and above the age of mandatory school enrollment if he or she was 7 years of age or over as of December 31 of a given year.

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Titel: Trends in Autism Prevalence: Diagnostic Substitution Revisited
Auteurs: Helen Coo
Hélène Ouellette-Kuntz
Jennifer E. V. Lloyd
Liza Kasmara
Jeanette J. A. Holden
M. E. Suzanne Lewis
Publicatiedatum: 01-07-2008
Uitgeverij: Springer US
Gepubliceerd in: Journal of Autism and Developmental Disorders / Uitgave 6/2008
Print ISSN: 0162-3257
Elektronisch ISSN: 1573-3432
DOI: https://doi.org/10.1007/s10803-007-0478-x

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