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Prevalence
Definition 1
The ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population. (NCI Thesaurus)
Definition 2
The total number of cases of a given disease in a specified population at a designated time. It is differentiated from INCIDENCE, which refers to the number of new cases in the population at a given time. (NLM, Medical Subject Headings)
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