Older men and women are more likely than young ones to have a child with autism, but this connection is not straightforward.

People with autism are at increased odds of having other psychiatric conditions, such as anxiety and depression, but the links can be counterintuitive.

The first rigorous estimate of autism in Catalonia, Spain, has found a prevalence on par with that in the United States; an independent study in Iran, meanwhile, has found a prevalence that lags far behind.

Autism is unusually common among people with congenital blindness, in part because the ability to see drives much of brain development.

Eight mental health conditions occur unusually often in autistic people, a new analysis suggests.

More than two-thirds of toddlers flagged for autism do not get assessed for the condition by specialists.

A new survey suggests autism prevalence has more than doubled over nine years, but the numbers may reflect only a rise in awareness and better data collection.

Less than 1 percent of young children in northern Vietnam have autism, but this prevalence is higher than in previous reports.

Estimates for autism’s prevalence in three U.S. states reveal significant inequalities in how children of different races and ethnicities are counted and assessed.

Social media is connecting families with researchers who study rare conditions related to autism — to the benefit of both.