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