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Duplication 7p is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Duplication 7p, or a subtype of Duplication 7p, 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 Duplication 7p as a "rare disease". More information about Duplication 7p is available from Orphanet
The term 'prevalence' of Duplication 7p usually refers to the estimated population
of people who are managing Duplication 7p at any given time.
The term 'incidence' of Duplication 7p refers to the annual diagnosis rate,
or the number of new cases of Duplication 7p 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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