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Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Trisomy 3 mosaicism as a "rare disease". More information about Trisomy 3 mosaicism is available from Orphanet
The term 'prevalence' of Trisomy 3 mosaicism usually refers to the estimated population
of people who are managing Trisomy 3 mosaicism at any given time.
The term 'incidence' of Trisomy 3 mosaicism refers to the annual diagnosis rate,
or the number of new cases of Trisomy 3 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.
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