To get this estimate, they looked at records in 2010 for 8-year-olds in 11 states. Through their research they also saw an increase in the number of children with higher IQs who fall on the autism spectrum – and a wide range of results depending on where they live (for example, only 1 in 175 was diagnosed with autism in Alabama, while 1 in 45 was diagnosed in New Jersey).
Why the big jump? No one can say for sure, but it could be due the growing awareness of autism and better identification of it in children.
And, also eye-opening, as noted in this NPR article, a 2011 study found that in South Korea, 1 in 38 children met the criteria for autism – and the U.S. is now on pace to reach the same conclusion within a few years.
Lynsey, Community Manager