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    • Source: Rate ratio

      • In epidemiology, a rate ratio, sometimes called an incidence density ratio or 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:





      Rate Ratio

      =


      Incidence Rate 1
      Incidence Rate 2




      {\displaystyle {\text{Rate Ratio}}={\frac {\text{Incidence Rate 1}}{\text{Incidence Rate 2}}}}


      where incidence rate is the occurrence of an event over person-time (for example person-years):





      Incidence Rate

      =


      events
      person time




      {\displaystyle {\text{Incidence Rate}}={\frac {\text{events}}{\text{person time}}}}


      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


      Odds ratio
      Ratio
      Risk ratio


      References

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