Prevalence

Autism affects 1 in 150 children.

One in 94 boys are affected by the disorder.

Boys are four times more likely than girls to have the diagnosis.




The recurrence risk estimate (the likelihood that the next child will be diagnosed with autism) is 8.6%.

If the first child with autism is a boy, the recurrence risk is 7%.

If the first child with autism is a girl, the recurrence risk is 14.5%.

When there are two or more children with autism in a family, the risk of recurrence is approximately 35%.