New autism numbers released on Thursday (Friday AEDT) suggest more US children are being diagnosed with the developmental condition and at younger ages.
In an analysis of 2018 data from nearly a dozen states, researchers at the Centres for Disease Control and Prevention found that among 8-year-olds, 1 in 44 had been diagnosed with autism. That rate compares with 1 in 54 identified with autism in 2016.
A student arrives as the sun rises during the first day of school in Flint, Michigan. Credit:AP
US autism numbers have been on the rise for several years, but experts believe that reflects more awareness and wider availability of services to treat the condition rather than a true increase in the number of affected children.
A separate CDC report released on Thursday said that children were 50 per cent more likely to be diagnosed with autism by age 4 in 2018 than in 2014.
“There is some progress being made and the earlier kids get identified, the earlier they can access services that they might need to improve their developmental outcome,” said CDC researcher and co-author Kelly Shaw.
Geraldine Dawson, director of Duke University’s Centre for Autism and Brain Development, said the new estimate is similar to one found in research based on screening a large population of children rather than on those already diagnosed.
As such, she said it may be closer to reflecting the true state of autism in US children than earlier estimates.
The CDC reports are based on data from counties and other communities in 11 states — some with more urban neighbourhoods, where autism rates tend to be higher. The rates are estimates and don’t necessarily reflect the entire US situation, the authors said.
Autism rates varied widely — from 1 in 26 in California, where services are plentiful, to 1 in 60 in Missouri.
Overall, autism prevalence was similar across racial and ethnic lines, but rates were higher among black children in two sites, Maryland and Minnesota. Until recently, US data showed prevalence among white children was higher.
At a third site, Utah, rates were higher among children from lower-income families than those from wealthier families, reversing a longstanding trend, said report co-author Amanda Bakian, a University of Utah researcher who oversees the CDC’s autism surveillance in that state.
Bakian said that likely reflects more coverage for autism services by Medicaid and private health insurers.
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