In epidemiology, incidence is a measure of the probability of occurrence of a given medical condition in a population within a specified period of time.
Applicable units are those of quantitykind:Incidence
https://en.wikipedia.org/wiki/Incidence_(epidemiology)
https://cdd.iec.ch/cdd/iec61987/iec61987.nsf/ListsOfUnitsAllVersions/0112-2---62720%23UAD064
In epidemiology, incidence is a measure of the probability of occurrence of a given medical condition in a population within a specified period of time.