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28 develop a condition from the time the disease first occurred until two years later, the cumulative incidence is 28 cases per 1,000 persons, i.e. 2.8%.

Incidence rate

The incidence rate can be calculated by dividing the number of subjects developing a disease by the total time at risk from all patients:

One of the important advantages of incidence rate is that it doesn't require all subjects to be present for the whole study because it's only interested in the time at risk.

Incidence vs. prevalence

Incidence

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