A measure of disease occurrence where the total number of individuals who have an attribute or disease at a particular time (it may be a particular period) divided by the population at risk of having the attribute or disease at that time or midway through the period. It is a proportion, not a rate. 

Source: Porta M. A Dictionary of Epidemiology. 5th ed. New York, NY: Oxford University Press; 2008. 

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  • prevalence