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Relative Risk (RR)

 

 

  • Risk of a certain event happening in one group versus the same event happening in another group
  • Usually related to risk factor exposure group versus control group
  • Ranges:

 

 

 

 

  1. RR> 1.0 – exposure increases risk
  2. RR= 1.0 – equal probability in both groups
  3. RR< 1.0 – exposure decreases risk

 

 

 

 

 

 

 

 

  • Example: RR= 1.3 for lung cancer in smokers compared to non-smokers
→ Smokers have a 1.3 higher risk of getting lung cancer than non-smokers

 

 

 

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