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This page presents a variety of statistics about Trisomy 22. The term 'prevalence' of Trisomy 22 usually refers to the estimated population of people who are managing Trisomy 22 at any given time. The term 'incidence' of Trisomy 22 refers to the annual diagnosis rate, or the number of new cases of Trisomy 22 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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