Prevalence and Incidence of Myotonic Dystrophy
Prevalance of Myotonic Dystrophy:
Type I myotonic dystrophy accounts for 98% of all cases of myotonic dystrophy, Genetics Home Reference website ... see also overview of Myotonic Dystrophy.
Myotonic Dystrophy: Rare Disease
Myotonic Dystrophy is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Myotonic Dystrophy, or a subtype of Myotonic Dystrophy,
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 Myotonic Dystrophy as a "rare disease".
More information about Myotonic Dystrophy is available from Orphanet
About prevalence and incidence statistics:
The term 'prevalence' of Myotonic Dystrophy usually refers to the estimated population
of people who are managing Myotonic Dystrophy at any given time.
The term 'incidence' of Myotonic Dystrophy refers to the annual diagnosis rate,
or the number of new cases of Myotonic Dystrophy 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.