Sex and gender differences in autism

Sex and gender differences in autism exist regarding prevalence, presentation, and diagnosis.

Men and boys are more frequently diagnosed with autism than women and girls. It is debated whether this is due to a sex difference in rates of autism spectrum disorders (ASD) or whether females are underdiagnosed. The prevalence ratio is often cited as about four males for every one female diagnosed. Other research indicates that it is closer to 3:1 or 2:1. One in every 42 males and one in 189 females in the United States is diagnosed with autism spectrum disorder. There is some evidence that females may also receive diagnoses somewhat later than males; however, thus far results have been contradictory.

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