Asperger syndrome is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Asperger syndrome, or a subtype of Asperger syndrome, affects less than 200,000 people in the US population.
Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Asperger syndrome as a "rare disease". More information about Asperger syndrome is available from Orphanet
The term 'prevalence' of Asperger syndrome usually refers to the estimated population
of people who are managing Asperger syndrome at any given time.
The term 'incidence' of Asperger syndrome refers to the annual diagnosis rate,
or the number of new cases of Asperger syndrome diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.
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