Autism May Be More Common Than Thought
U.S. government study estimates that 1 of every 91 children is
affected
Posted October 5, 2009
By Serena Gordon HealthDay Reporter
MONDAY, Oct. 5 (HealthDay News) -- While research has suggested
that the prevalence of autism spectrum disorders in American
children was about 1 of every 150 children, a new government study
estimates that the prevalence is more likely about 1 in every 91
children.
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published in the October issue of Pediatrics, estimated that 110 of
every 10,000 U.S. youngsters will be diagnosed at some point in
their lives with an autism spectrum disorder. That currently
translates to about 673,000 American children with some form of
autism, according to the study.
"I think this is a very important study that says the prevalence of
autism spectrum disorders may be even higher than we suspected
previously," said Geraldine Dawson, chief scientific officer of
Autism Speaks.
br> "Autism is a major public health challenge, and this study
is another call to action that we need to be able to provide care
across the lifespan," she said.
Autism spectrum disorders are a group of neurodevelopmental
disorders, including autism, Asperger syndrome and pervasive
developmental disorder. Severity varies from child to child.
Characteristic behavior includes impaired social interaction,
difficulty with communication and repetitive behaviors. Over a
lifetime, health-care costs for someone with autism are estimated
to be more than $1.6 million, according to the study.
The researchers culled data for the study from the 2007 National
Survey of Children's Health, which included more than 78,000
children from across the country, all between 3 and 17 years
old.
Parents of 1,412 children reported that a doctor had given their
child a diagnosis of autism spectrum disorder. Only 913 parents,
however, said their child currently had an autism spectrum
disorder.
Of that group, 494 parents classified their child's autism as mild,
and 320 parents described it as moderate. Just 90 parents said
their child's autism was severe.
Cynthia Johnson, director of the Autism Center at Children's
Hospital of Pittsburgh, part of the University of Pittsburgh
Medical Center, attributed the increase to better diagnostic
criteria and an increasing awareness of autism.
"This is more data that adds to what's already in existence that
shows autism spectrum disorders are common," Johnson said.
As to the large percentage of children who were diagnosed with an
autism spectrum disorder in the past, but whose parents said they
currently were not autistic, Johnson said the reasons behind that
finding were not clear.
She theorized, though, that "symptoms may lessen with early
intensive services, especially for milder cases."
The authors also suggested that autism might have been considered
during the initial diagnosis of a child but later dropped if the
child turned out to have another disorder.
"We do know that individuals with autism can have a diagnosis early
on and then lose that diagnosis, and we don't know the factors that
could explain this," Dawson said. "Is it having received good,
early behavioral intervention? Or, is there a group of kids that
have better biological outcomes? Or, it may have something to do
with how kids get diagnosed at different ages. Maybe as kids
develop, they may not be getting the same kind of evaluations."
The study also found that the odds of receiving an autism spectrum
disorder diagnosis were four times higher for boys than girls, and
that non-Hispanic black and multiracial children were less likely
to have an autism spectrum disorder than white children.
More information
The U.S. National Institute of Neurological Disorders and Stroke
has more on autism.
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