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Incidence

Reviewed By Linda J. Vorvick MD, Medical Director, MEDEX Northwest Division of Physician Assistant St…more »

Definition

Incidence is the number of new cases of a condition, symptom, death, or injury that develop during a specific time period, such as a year. The number is often expressed as a percentage of a population. For example, 25% of Americans were diagnosed with the flu in 2002.

Incidence shows the likelihood that a person in that population will be affected by the condition.

Date Last Reviewed: 05/02/2009
Copyright: ADAM Health Illustrated Encyclopedia

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