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Why Some Children May 'Grow Out' of Autism

But Kids With Several Physical, Psychological Problems May Be Less Likely to Improve Over Time, Study Shows
WebMD Health News

Jan. 23, 2012 -- Some kids with autism will no longer qualify for that diagnosis as they grow older.

Now a new study shows that whether or not a child “outgrows” their autism may be related to the number and severity of other physical and psychological problems that are part of their original diagnosis.

The study is published in the journal Pediatrics. It compared more than 1,300 children with a past or current diagnosis of autism. About one-third of the kids in the survey had once been diagnosed with autism but were no longer considered to have the condition.

“The main study objective is to try to see what co-existing conditions, if any, would help us to distinguish people who grow out of the autism diagnosis,” says researcher Li-Ching Lee, PhD, ScM, a research scientist at the Johns Hopkins Bloomberg School of Public Health, in Baltimore, Md.

In addition to autism, researchers asked parents if their children had ever been diagnosed with other problems, including attention-deficit hyperactivity disorder (ADHD), a learning disability, developmental delay, speech or hearing problems, anxiety, depression, behavioral or conduct problems, and seizures or epilepsy.

Researchers adjusted their results to account for the influences of other things that are known to affect autism and development, including race and gender, the family’s income and education level, health insurance coverage, or whether the children were enrolled in a personalized education plan at school.

Conditions That Complicate Autism

Among preschoolers, kids who were diagnosed with a current diagnosis of autism were almost five times more likely to have two or more other conditions than those kids who had a previous diagnosis of autism. Learning disabilities and developmental delays were the most significant predictors of having a current autism diagnosis in 3- to 5-year-olds.

Among 6- to 11-year-olds, kids with a current autism diagnosis were significantly more likely than kids with a past diagnosis to have once had a speech problem or to be currently experiencing moderate to severe anxiety.

Among teens, kids with a current autism diagnosis were significantly more likely to also have a speech problem or mild epilepsy than kids with a past autism diagnosis.

Having a past hearing problem, on the other hand, made it significantly more likely that a child or teen would no longer be diagnosed with autism.

The symptoms of hearing impairment in young children can mimic symptoms of autism. In some cases, when the hearing problems are addressed, the behavioral and developmental problems also resolve.

Experts who were not involved in the research say it’s important for a couple of reasons.

Treatment May Help Kids With Co-Occurring Conditions

“It illustrates, again, the fact that there are some common co-occurring disorders that do occur in young individuals with autism and they’re relatively frequent. And this is another way of getting some insight into how frequent they are,” says Joseph Horrigan, MD, head of medical research for the New York City-based nonprofit Autism Speaks.

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