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MPS 3 C 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 C, or a subtype of MPS 3 C, affects less than 200,000 people in the US population.
The term 'prevalence' of MPS 3 C usually refers to the estimated population
of people who are managing MPS 3 C at any given time.
The term 'incidence' of MPS 3 C refers to the annual diagnosis rate,
or the number of new cases of MPS 3 C 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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