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Where can I find distribution of people on the autistic spectrum? What percentage have Kanner's Syndrome? What percentage HFA?
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Different sources give varying estimates of the prevalence of autism spectrum disorders in general, from around 6 per 1000 to as high as 10 per 1000 individuals. Furthermore, the classification of ASDs is still somewhat vague; for example, "high-functioning autism" may be classified as autism, Asperger's, or PDD-NOS (pervasive developmental disorder not otherwise specified).
The one full set of statistics I found correlates well with the low-end estimates of ASD frequency:
All ASDs, 6 per 1000
PDD-NOS, 3.7 per 1000
Autism, 1-2 per 1000
Asperger's, 0.6 per 1000
Childhood disintegrative disorder*, 0.02 per 1000
http://en.allexperts.com/q/Autism-1010/2008/8/statistics-autism-apsergers.htm
http://en.wikipedia.org/wiki/Autism_spectrum_disorder#Epidemiology
http://en.wikipedia.org/wiki/Autism_spectrum_disorder#Classification
* Note that the National Institutes of Health consider ASDs to include only autism, Asperger's, and PDD-NOS. Childhood disintegrative disorder and Rett syndrome are considered pervasive developmental disorders not on the autism spectrum. Kanner syndrome is a synonym for classical autism.
http://www.nichd.nih.gov/health/topics/asd.cfm
http://www.medterms.com/script/main/art.asp?articlekey=13915
The one full set of statistics I found correlates well with the low-end estimates of ASD frequency:
All ASDs, 6 per 1000
PDD-NOS, 3.7 per 1000
Autism, 1-2 per 1000
Asperger's, 0.6 per 1000
Childhood disintegrative disorder*, 0.02 per 1000
http://en.allexperts.com/q/Autism-1010/2008/8/statistics-autism-apsergers.htm
http://en.wikipedia.org/wiki/Autism_spectrum_disorder#Epidemiology
http://en.wikipedia.org/wiki/Autism_spectrum_disorder#Classification
* Note that the National Institutes of Health consider ASDs to include only autism, Asperger's, and PDD-NOS. Childhood disintegrative disorder and Rett syndrome are considered pervasive developmental disorders not on the autism spectrum. Kanner syndrome is a synonym for classical autism.
http://www.nichd.nih.gov/health/topics/asd.cfm
http://www.medterms.com/script/main/art.asp?articlekey=13915
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