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PARC syndrome is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that PARC syndrome, or a subtype of PARC 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 PARC syndrome as a "rare disease". More information about PARC syndrome is available from Orphanet
The term 'prevalence' of PARC syndrome usually refers to the estimated population
of people who are managing PARC syndrome at any given time.
The term 'incidence' of PARC syndrome refers to the annual diagnosis rate,
or the number of new cases of PARC 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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