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CDC Releases New Statistics on Autism

At Least 300,000 U.S. Children Diagnosed With Autism as of 2003-2004
WebMD Health News
Reviewed by Louise Chang, MD

May 4, 2006 -- At least 300,000 school-aged U.S. children had ever been diagnosed with autism as of 2003-2004, the CDC estimates.

That estimate is based on two national health surveys conducted by the CDC in 2003-2004. The results appear in the CDC's Morbidity and Mortality Weekly Report.

The surveys asked parents if their child had ever been diagnosed with autism. The surveys show that about 5.6 per 1,000 children aged 4-17 years had a parent-reported autism diagnosis.

The surveys also show that kids with parent-reported diagnosed autism were more likely than other children to have special health care needs and "high" levels of emotional symptoms, conduct problems, hyperactivity, and peer problems.

The CDC describes autism and related conditions as "lifelong developmental disabilities characterized by repetitive behaviors and social and communication problems."

'Major Public Health Concern'

"Taken together, all these studies affirm that autism is a condition of major public health concern that affects many families," Jose Cordero, MD, MPH, told reporters in a teleconference.

Cordero directs the CDC's National Center on Birth Defects and Developmental Disabilities (NCBDDD).

Cordero says the prevalence rates are within the range of previous estimates. "The surveys reported today by themselves can't tell us much about autism's trends," Cordero says.

"We recognize that parents want answers," Cordero says. "They want to know how to protect their children; what can they do to help them stay healthy. If children have autism, parents want to know what caused it, the most effective treatments, and how can they lower their risk if they plan to have other children.

"This is perfectly understandable," Cordero says. "We share the frustration about not having more answers about the causes and cure of autism."

About the Surveys

The CDC's latest numbers came from the CDC's National Health Interview Survey (NHIS) and the National Survey of Children's Health (NSCH).

Participants were parents, but the same parents didn't take both surveys. The surveys covered various health topics.

One question on both surveys asked, "Has a doctor or health care provider ever told you that [child's name] has autism?" The NHIS estimates that 5.7 per 1,000 kids had a parent-reported autism diagnosis. The NSCH had a similar estimate of 5.5 per 1,000 kids.

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