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Monosomy 18 mosaicism is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Monosomy 18 mosaicism, or a subtype of Monosomy 18 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 Monosomy 18 mosaicism as a "rare disease". More information about Monosomy 18 mosaicism is available from Orphanet
The term 'prevalence' of Monosomy 18 mosaicism usually refers to the estimated population
of people who are managing Monosomy 18 mosaicism at any given time.
The term 'incidence' of Monosomy 18 mosaicism refers to the annual diagnosis rate,
or the number of new cases of Monosomy 18 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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