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The term high-functioning autism was used in a manner similar to Asperger syndrome, another outdated classification. The defining characteristic recognized by psychologists was a significant delay in the development of early speech and language skills, before the age of three years. [ 12 ]
A 2003 review of epidemiological studies of children found autism rates ranging from 0.03 to 4.84 per 1,000, with the ratio of autism to Asperger syndrome ranging from 1.5:1 to 16:1; [142] combining the geometric mean ratio of 5:1 with a conservative prevalence estimate for autism of 1.3 per 1,000 suggests indirectly that the prevalence of AS ...
In 2013, one study reported that 60% and 44% of 93 children with ASD were positive for FRα-blocking and binding autoantibodies, respectively. This high rate of anti-FRα autoantibody positivity was confirmed by Ramaekers et al. who compared 75 children with ASD to 30 non-autistic "controls".
Autistic children are less likely to make requests or share experiences and more likely to simply repeat others' words . [105] The CDC estimated in 2015 that around 40% of autistic children do not speak at all. [106] Autistic adults' verbal communication skills largely depend on when and how well speech is acquired during childhood. [102]
Josef Schovanec points to the existence of a "myth of the high-functioning autistic person", sustaining the belief in "a link between the alleged degree of autism and behavioral disorders". [216] As an example, he cites the recruitment experience of the Andros group, which mainly recruited young adults with nonverbal autism, [ 56 ] who were ...
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A high-functioning group (around 25 percent) whose symptoms more or less overlap with that of what was Asperger syndrome, while also not meeting the then current criteria for autism spectrum disorder, but who completely differ from those with Asperger syndrome in terms of having a lag in language development and/or mild cognitive impairment ...