Fact sheet: Autism prevalence

Recent articles

Explore changes in the diagnosis over time, global differences, the role of genes and the environment, and more.

A decades’ long increase is the focus of intense scrutiny; here, we recap our coverage and resources on what the research says.

Additional stories

Birds-eye-view of children sitting on grass in a circle formation each inside a hula hoop to represent improved identification and diagnosis of autism.

U.S. autism prevalence inches upward as racial gaps close

Autism prevalence in the United States rose to 1 in 44 children in 2018, up from 1 in 54 in 2016.

By Peter Hess
2 December 2021 | 2 min read
Multi-ethnic elementary school children writing in classroom.

New U.S. data show similar autism prevalence among racial groups

Autism prevalence in the United States continues to rise, according to a new study of 8-year-old children in 11 states. Boys are 4.3 times as likely as girls are to have autism, a ratio that is consistent with previous estimates.

By Laura Dattaro, Peter Hess
26 March 2020 | 7 min read

Prevalence estimates for autism indicate bias against non-white groups

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.

By Jill Adams
20 May 2019 | 5 min read

New autism diagnoses shifting toward mild end of spectrum

Although the number of people diagnosed with autism is on the rise, the proportion with severe features has dropped since 2000.

By Nicholette Zeliadt
2 February 2017 | 4 min read
A map of England displaying autism incidence.

Autism incidence in England varies by ethnicity, class, location

High rates of autism are linked to lower socioeconomic status and minority ethnic groups, according to the largest-ever autism incidence study.

By Isabel Ruehl
6 December 2022 | 5 min read
Research image of neural activity in mouse auditory cortices.

Rise in autism prevalence but not traits; and more

Here is a roundup of autism-related news and research spotted around the web for the week of 7 July.

By Jill Adams
8 July 2025 | 2 min read
Illustration of overlapping, multi-colored human head silhouettes.

CDC autism prevalence numbers warrant attention—but not in the way RFK Jr. proposes

The head of the U.S. Department of Health and Human Services is ignoring decades of research findings.

By Lynn Waterhouse
1 May 2025 | 7 min read
Young child stacks colored blocks on a table.

High prevalence of developmental delay strains Australia’s support systems

The nation needs to build capacity to support the roughly 20 percent of children in Australia who have developmental delay.

By Andrew Whitehouse
1 September 2023 | 5 min read
A wadded up piece of red paper sits next to a wastebasket filled with similar pieces of crumped red paper.

Controversial ‘cost of autism’ paper retracted

The journal’s decision comes two years after Spectrum covered backlash from researchers over the study.

By Calli McMurray
13 June 2023 | 3 min read
Two teenage girls sit next to each other on a couch, one looking at a cell phone while the other uses a tablet computer.

Turner syndrome tied to autism

Most people with the X-linked syndrome have autism traits, and about one-quarter meet diagnostic criteria for the condition.

By Emmet Fraizer
5 January 2023 | 4 min read

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A fly over a background of waves of different colors.

Drosophila, like vertebrates, filter sensory information during sleep

Predictive sensory processing in sleeping Drosophila echoes vertebrate research, establishing an evolutionarily conserved neural signature of sleep.

By Siddhant Pusdekar
8 July 2025 | 5 min listen
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Neuroscience’s open-data revolution is just getting started

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By Benjamin Dichter
7 July 2025 | 8 min listen
Research image of portions of the adult dentate gyrus.

Machine learning spots neural progenitors in adult human brains

But the finding has not settled the long-standing debate over the existence and extent of neurogenesis during adulthood, says Yale University neuroscientist Juan Arellano.

By Claudia López Lloreda
3 July 2025 | 7 min listen