How Is Number Needed to Treat (NNT) Calculated

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

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