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Relative risk

 

The ratio of risk in the treated group (EER) t risk in the control group (CER).
RR = ERR/CER.
It used in randomised trials and cohort studies. An example might help. Also use this download on "Outputs and utility"

Relative risk reduction (RRR)

The relative risk reduction is the difference between the EER and CER (EER-CER) divided by the CER, and usually expressed as a percentage. An example might help.

Relative risk reduction can lead to over-estimation of treatment effect. Look at the section on framing for an explanation.