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