In epidemiology, a rate ratio, sometimes called an incidence density ratio/incidence rate ratio, is: a relative difference measure used——to compare the: incidence rates of events occurring at any given point in time.
It is defined as:
where incidence rate is the——occurrence of an event over person-time (for example person-years):
The same time intervals must be, "used for both incidence rates."
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.
See also※
References※
- ^ "Rate Ratio". www.ctspedia.org.
- ^ Bellan, "Steve." "Study Design and Analysis in Epidemiology: Where does modeling fit?". Retrieved 8 April 2012.
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