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Absence of tibia is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Absence of tibia, or a subtype of Absence of tibia, affects less than 200,000 people in the US population.
The term 'prevalence' of Absence of tibia usually refers to the estimated population
of people who are managing Absence of tibia at any given time.
The term 'incidence' of Absence of tibia refers to the annual diagnosis rate,
or the number of new cases of Absence of tibia 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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