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Sources
- CDC. Data and Statistics on Autism Spectrum Disorder.
- CDC. Prevalence and Early Identification of Autism Spectrum Disorder Among Children Aged 4 and 8 Years — Autism and Developmental Disabilities Monitoring Network, 16 Sites, United States, 2022. MMWR Surveillance Summaries 2025;74(2).
- National Institute of Mental Health (NIMH). Autism Spectrum Disorder.
- NHS. Signs of autism in adults.
- NHS. What is autism?
- World Health Organization (WHO). Autism (fact sheet).
- CDC. Signs and Symptoms of Autism Spectrum Disorder.
Common questions
How common is autism?
In CDC's 2022 data from 16 U.S. communities, about 1 in 31 eight-year-olds had been identified with autism. It was about 3.4 times as common in boys as in girls.
Can adults, even older adults, be diagnosed with autism?
Yes. NIMH says autism can be diagnosed at any age. It is often harder in adults, but a diagnosis can help people understand past challenges and find support.
Do vaccines cause autism?
No. WHO says research over many years shows the MMR vaccine does not cause autism, and the study that claimed it did was withdrawn. The NHS says autism is not caused by vaccines.
Is this quiz an autism test?
No. It is for learning only. If you wonder whether you might be autistic, see the WhySigh signs checklist and talk with a doctor or a trained professional.