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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 Microdeletion 3q29 as a "rare disease". More information about Microdeletion 3q29 is available from Orphanet
The term 'prevalence' of Microdeletion 3q29 usually refers to the estimated population
of people who are managing Microdeletion 3q29 at any given time.
The term 'incidence' of Microdeletion 3q29 refers to the annual diagnosis rate,
or the number of new cases of Microdeletion 3q29 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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