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Incidence

11 June, 2021 by

The incidence rate is the rate at which new events occur in a population.  The numerator is the number of new events that occur in a defined period or other physical span.  The denominator is the population at risk of experiencing the event during this period, sometimes expressed as person-time; it may instead be in other units, such as passenger-miles.  “The number of instances of illness commencing, or of persons falling ill, during a given period in a specified population.  More generally, the number of new health-related events in a defined population within a specified period of time.  It may be measured as a frequency count, a rate, or a proportion”.

Porta, M., A dictionary of epidemiology. Fifth Edition ed. 2008, New York: Oxford University Press.

Also see Prevalence.

 

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