Blaxill, Nevison, Zahorodny: California Autism Prevalence Trends from 1931-2014 and Comparison to National ASD Data from IDEA and ADDM
California autism prevalence trends from 1931-2014 and comparison to national ASD data from IDEA and ADDM authored by Mark Blaxill, Cindy Nevison and Walter Zahorodny was published last night in the Journal of Autism and Developmental Disorders (JADD). The paper is Open Access and can be found at this link. Congratulations and thank you to Mark, Cindy and Walter.
California autism prevalence trends from 1931-2014 and comparison to national ASD data from IDEA and ADDM
Time trends in U.S. autism prevalence from three ongoing datasets [Individuals with Disabilities Education Act, Autism and Developmental Disabilities Monitoring Network, and California Department of Developmental Services (CDDS)] are calculated using two different methods: (1) constant-age tracking of 8 year-olds and (2) age-resolved snapshots. The data are consistent across methods in showing a strong upward trend over time. The prevalence of autism in the CDDS dataset, the longest of the three data records, increased from 0.001% in the cohort born in 1931 to 1.2% among 5 year-olds born in 2012. This increase began around ~ 1940 at a rate that has gradually accelerated over time, including notable change points around birth years 1980, 1990 and, most recently, 2007.