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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.

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


Taber's Medical Dictionary Online. Incidence. www.tabers.com/tabersonline/view/Tabers-Dictionary/729742/0/incidence?q=Incidence. Accessed May 3, 2021.

Review Date 5/3/2021

Updated by: Linda J. Vorvick, MD, Clinical Associate Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.