As many as 1 in 40 U.S. children have been diagnosed with autism, continuing an upward trend.
The new figure comes from parents of 50,000 children nationwide who completed the 2016 National Survey of Children’s Health. Researchers estimate 1.5 million American children ages 3 to 17 have been diagnosed with autism, for a prevalence rate of 2.5 percent.
“It is difficult to pin down an exact number. We don’t have a biological marker for autism,” said Michael Kogan of the Health Resources and Services Administration and lead author on the new report in the journal Pediatrics. “We know that in terms of…
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