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