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MPS 3 D is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that MPS 3 D, or a subtype of MPS 3 D, 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 affetcs 1 person per 2,000. They list MPS 3 D as a "rare disease". More information about MPS 3 D is available from Orphanet
The term 'prevalence' of MPS 3 D usually refers to the estimated population of people who are managing MPS 3 D at any given time. The term 'incidence' of MPS 3 D refers to the annual diagnosis rate, or the number of new cases of MPS 3 D 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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