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The term high-functioning autism was used in a manner similar to Asperger syndrome, another outdated classification.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]
In 1994, Sally Ozonoff, David L. Strayer, William M. McMahon and Francis Filloux compared information processing skills in high functioning autistics and controls: "The performance of high-functioning autistic children was compared with that of two matched control groups, one with Tourette Syndrome and the other developmentally normal.
Eighty-seven percent of families with an autistic child report that they don’t take family vacations, according to a 2019 survey of 1,000 parents by the International Board of Credentialing and ...
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PDD-NOS included atypical autism, a diagnosis defined in the ICD-10 for the case that the criteria for autistic disorder were not met because of late age of onset, or atypical symptomatology, or both of these. [5] Even though PDD-NOS was considered milder than typical autism, this was not always true. While some characteristics may be milder ...