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ERIC Number: EJ827755
Record Type: Journal
Publication Date: 2009-Mar
Pages: 7
Abstractor: As Provided
Reference Count: N/A
ISBN: N/A
ISSN: ISSN-0162-3257
The Incidence of Clinically Diagnosed versus Research-Identified Autism in Olmsted County, Minnesota, 1976-1997: Results from a Retrospective, Population-Based Study
Barbaresi, William J.; Colligan, Robert C.; Weaver, Amy L.; Katusic, Slavica K.
Journal of Autism and Developmental Disorders, v39 n3 p464-470 Mar 2009
Autism prevalence studies have often relied on administrative prevalence or clinical diagnosis as case-identification strategies. We report the "incidence" of "clinical diagnoses" of autism spectrum disorders (ASD), versus "research-identified" autism among residents of Olmsted County, Minnesota, age [less than or equal] 21 years, from 1976-1997. The incidence of "clinically diagnosed" ASD (with 95% CI) was 1.5 per 100,000 (0.0-3.7) in 1980-1983 and 33.1 (22.8-43.3) in 1995-1997, a 22.1-fold increase. In contrast, the incidence of "research-identified" autism increased from 5.5 (1.4-9.5) per 100,000 to 44.9 (32.9-56.9), an 8.2-fold increase. Only 46.8% of research-identified cases received a clinical diagnosis of ASD. These findings demonstrate the potential for misleading interpretation of results from epidemiologic studies that rely on clinical diagnosis of autism to identify cases.
Springer. 233 Spring Street, New York, NY 10013. Tel: 800-777-4643; Tel: 212-460-1500; Fax: 212-348-4505; e-mail: service-ny@springer.com; Web site: http://www.springerlink.com
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Minnesota