Which term is used to describe the reduction of risk because of an experimental treatment?
a. Relative risk reduction
b. Number needed to treat
c. Control event rate
d. Absolute risk reduction
ANS: D
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A Relative risk ratio is the risk of the event after the experimental treatment as a percentage of the original risk.
B Number needed to treat is the estimated number of treatment patients needed versus standard treatment for one patient to benefit.
C Control event rate is the proportion of patients in whom an event is observed in the control group.
D Absolute risk reduction is the description of risk in absolute terms because it is the difference between risk observed in those who did and did not experience the event.
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