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The epidemiology of autism is the study of the incidence and distribution of autism spectrum disorders (ASD). A 2022 systematic review of global prevalence of autism spectrum disorders found a median prevalence of 1% in children in studies published from 2012 to 2021, with a trend of increasing prevalence over time.
A study published in 2014 examined the reading and math achievement profiles and their changes over time within a sample of children between the ages 6–9 diagnosed with an autism spectrum disorder. What they found was that there are four distinct achievement profiles: higher-achieving (39%), hyperlexia (9%), hypercalculia (20%) and lower ...
Autistic children are less likely to make requests or share experiences and more likely to simply repeat others' words . [106] The CDC estimated in 2015 that around 40% of autistic children do not speak at all. [107] Autistic adults' verbal communication skills largely depend on when and how well speech is acquired during childhood. [103]
Autism rights movement (ARM) – (a subset of the neurodiversity movement, also known as the anti-cure movement or autistic culture movement) is a social movement that encourages autistic people, their caregivers and society to adopt a position of neurodiversity, accepting autism as a variation in functioning rather than a mental disorder to be ...
Many of the non-autistic co-twins had learning or social disabilities. For adult siblings the risk for having one or more features of the broader autism phenotype might be as high as 30%. [15] In spite of the strong heritability, most cases of autism occur sporadically with no recent evidence of family history.
40 parents of autistic children met in Tokyo in December 1966. In February 1967, they and others formed the Association of Autistic Children's Parents. [237] A national body was established in 1968. [238] In time, this would become Autism Society Japan (日本自閉症協会).
The following notation will be used throughout this article: is a fixed positive integer and is a fixed non-empty open subset of Euclidean space. = {,,, …} denotes the natural numbers.
The autistic community has developed a number of commonly used terms, such as: Aspie – a person with Asperger syndrome. [16] Autie or Autist – an autistic person. It can be contrasted with aspie to refer to those specifically diagnosed with classic autism or another autism spectrum disorder. [17]