Relative Risk (RR)

Question 1

Relative Risk

Answer 1

Risk or incidence of the outcome in the treatment group / risk or incidence of the outcome in the control group :

How many time more likely it is that the event will occur in the tx group relative to the control group.

RR = 1 : no diferrence bw 2 grps = tx no effect
RR < 1 : tx decreases the risk of the outcome
RR > 1 : tx increased the risk of the outcome