Rate ratio

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

A rate ratio (sometimes called an incidence density ratio) in epidemiology, is a relative difference measure used to compare the incidence rates of events occurring at any given point in time. A common application for this measure in analytic epidemiologic studies is in the search for a causal association between a certain risk factor and an outcome.[1]


Where incidence rate is the occurrence of an event over person-time, for example person-years.

Note: the same time intervals must be used for both incidence rates.[2]

See also[edit]


  1. ^ Bellan, Steve. "Study Design and Analysis in Epidemiology: Where does modeling fit?". Retrieved 8 April 2012.
  2. ^ a b "Rate Ratio". www.ctspedia.org.