About 1 in 40 children in the United States has autism, according to a survey conducted in 2016. Roughly 30 percent of those children were not being treated for the condition at the time.

Children with autism are more likely to have both sleep problems and constipation than would be expected based on the prevalence of each of those conditions.

Young people with autism have more psychiatric and medical conditions than do their typical peers or those with attention deficit hyperactivity disorder.

Children with autism are more likely to be prescribed antipsychotic medications earlier and for longer periods than are their typical peers.

In people with fragile X syndrome, autism is often accompanied by seizures, trouble falling or staying asleep and anxiety.

People with autism who have a mood disorder or sleep problems are more likely to be admitted to inpatient psychiatric units than those who do not have one of these other conditions.

Children with autism are more likely than their neurotypical peers to have any of a host of medical conditions.

Many children with autism who take antipsychotic medications do not receive behavioral therapy.

Young adults with autism face many new expectations and challenges — with none of the support that is available during high school.

Although the number of people diagnosed with autism is on the rise, the proportion with severe features has dropped since 2000.