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