How is number needed to treat (NNT) calculated?
A) One divided by the absolute risk reduction
B) Incidence rate of disease in exposed population over the incidence of disease in unexposed population
C) Event rate in control group minus event rate in experimental group
D) Number of people with given disease in given population at one point in time divided by the total in given population at same point in time

Question

Quizplus · Accepted Answer

The number needed to treat (NNT) is calculated as the reciprocal of the absolute risk reduction (ARR). NNT = 1/ARR. The ARR is the difference between the control event rate (CER) and the experimental event rate (EER).

How Is Number Needed to Treat (NNT) Calculated