Autism is Likely Considerably Undercounted: Study New York, 26 Jan (ONA) --- New research suggested that autism prevalence rose as much as 500% in recent decades, but it still may be underdiagnosed.In an analysis of data on 8-year-olds in the New York-New Jersey metropolitan area in the United States (US) researchers found that the number of children with autism and intellectual disability doubled over the time period.Among those without intellectual disability, however, the increase was fivefold. Still, the study, published in the journal Pediatrics, found that disparities ...