Incidence is the number of new cases of a condition, symptom, death, or injury that arise during a specific period of time, such as a year. It is often expressed as a percentage of a population (e.g., 25% of American residents were diagnosed with the flu in 2002).
Incidence conveys the likelihood that an individual in that population will be affected by the condition.
by David A. Scott, M.D.
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