About 10 percent of people with a large mutation in chromosome 22 have autism, attention deficit hyperactivity disorder or intellectual disability.

More boys than girls have autism; diagnostic biases and genetic factors may explain the skewed sex ratio.

The bulk of the increase in autism prevalence in the United States between 2000 and 2012 can be attributed to children on the mild end of the spectrum.

About 1 in 59 children in the United States has autism, according to data released today by the U.S. Centers for Disease Control and Prevention.

Children with autism typically have four or five other conditions, such as attention deficit hyperactivity disorder, that can affect when they are diagnosed.

Girls with autism may have less severe restricted and repetitive behaviors than do boys on the spectrum.

A semirural Colombian town called Ricaurte is home to the largest recorded genetic cluster of people with mutations linked to fragile X syndrome.

People with autism who are admitted to the hospital for self-injury tend to have low intelligence quotients and severe repetitive behaviors.