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searches - My saved topics - My newsletter Incidence is a
measure of the risk of developing some new condition within a
specified period of time. Although sometimes loosely expressed
simply as the number of new cases during some time period, it is
better expressed as a proportion or a rate with a denominator.
Incidence proportion (also known as cumulative incidence) is the
number of new cases within a specified time period divided by
the size of the population initially at risk. For example, if a
population initially contains 1,000 non-diseased persons and 28
develop a condition over two years of observation, the incidence
proportion is 28 cases per 1,000 persons, i.e. 2.8%. The
incidence rate is the number of new cases per unit of person-
time at risk. In the same ex