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This page presents a variety of statistics about Deletion 20p. The term 'prevalence' of Deletion 20p usually refers to the estimated population of people who are managing Deletion 20p at any given time. The term 'incidence' of Deletion 20p refers to the annual diagnosis rate, or the number of new cases of Deletion 20p 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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