Incidence

The rate of occurrence of a disease in a population within a specified period of time, often expressed as the number of cases of a disease arising per 100,000 individuals per year (or per 100,000 person-years). (ICRP Publication 103, 2007)

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from ICRP Publication 131, 2015

The rate of occurrence of a disease in a population within a specified period of time, often expressed as the number of cases of a disease arising per 100,000 individuals per year, or per 100,000 person-years.