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Relative risk (RR) is the measure of absolute risk in one population as a proportion of absolute risk in another. It a measurement of the strength of association.

It is calculated as follows:

  • Incidence among exposed / Incidence among unexposed; OR
  • a/(a+b) OVER c/(c+d)
  • The higher risk is usually (but not always) the numerator
  • RR cannot be calculated for case-control studies
  • RR is not influenced by the magnitude of background risk
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Q: What is relative risk and how is it calculated?
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