Monday, May 09, 2011
Autism May be More Common Worldwide than Previously Thought
Autism may be more common worldwide than previously thought, according to researchers from the George Washington University (GW) and Yale University. The researchers conducted an autism prevalence study for the first time in South Korea and estimated that the prevalence of autism spectrum disorder is as high as 2.6 percent of the population of school-age children, equivalent to 1 in 38 children.
The study “Prevalence of Autism Spectrum Disorder in a Total Population Sample,” scheduled to be published online on May 9 in the American Journal of Psychiatry, reports on autism among approximately 55,000 children ages 7 to 12 years in a South Korean community. These children include those enrolled in special education services and a disability registry, as well as children enrolled in general education schools.
“While this study does not suggest that Korean children have more autism than other populations or that a more accurate rate for the U.S. is closer to 2.64 percent, it does suggest that autism may be more common than previously thought,” said Roy Richard Grinker, GW professor of anthropology and international affairs and member of the study’s research team. “This research powerfully demonstrates that the methods one uses to study prevalence will profoundly influence the estimate,” said Professor Grinker, author of Unstrange Minds: Remapping the World of Autism.
Under the leadership of Yale psychiatrist and epidemiologist Young-Shin Kim, all children were screened with surveys distributed to both parents and teachers, and then evaluated using comprehensive diagnostic assessments. Unlike the studies carried out by the Centers for Disease Control and Prevention (CDC), which analyzed records and registries, the researchers attempted to look at each child in every school, even those who did not have a record of any special education need. This method unmasked cases that could have gone unnoticed to epidemiologists relying on a records-based approach.
“This study is further evidence that autism transcends cultural, geographic and ethnic boundaries and that autism is a major global public health concern, not limited to the Western world,” said Autism Speaks Chief Science Officer Geraldine Dawson. “Notwithstanding the need for replication, this study also provides important evidence that the application of validated, reliable and commonly accepted screening procedures and diagnostic criteria applied to a total population has the potential to yield an ASD prevalence exceeding previous estimates.”
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