a measure of morbidity based on the number of new episodes of illness arising in a population over a period of time. It can be expressed in terms of sick persons or episodes per 1000 individuals at risk. Compare prevalence rate.
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the probability of developing a particular disease during a given period of time; the numerator of the rate is the number of new cases during the specified time period and the denominator is the population at risk during the period. Cf. prevalence r.Medical dictionary. 2011.