Prevalence and Incidence of Trisomy 20 mosaicism
Trisomy 20 mosaicism: Rare Disease
Trisomy 20 mosaicism is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Trisomy 20 mosaicism, or a subtype of Trisomy 20 mosaicism,
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 Trisomy 20 mosaicism as a "rare disease".
More information about Trisomy 20 mosaicism is available from Orphanet
About prevalence and incidence statistics:
The term 'prevalence' of Trisomy 20 mosaicism usually refers to the estimated population
of people who are managing Trisomy 20 mosaicism at any given time.
The term 'incidence' of Trisomy 20 mosaicism refers to the annual diagnosis rate,
or the number of new cases of Trisomy 20 mosaicism 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.