ERIC Number: EJ827755
Record Type: Journal
Publication Date: 2009-Mar
Abstractor: As Provided
Reference Count: N/A
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.
Descriptors: Autism, Incidence, Adults, Clinical Diagnosis, Identification, Counties, Population Trends, Epidemiology
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers - Location: Minnesota