Number needed to treat

Common card · No. 457662

The number needed to treat (NNT) or number needed to treat for an additional beneficial outcome (NNTB) is an epidemiological measure used in communicating the effectiveness of a health-care intervention, typically a treatment with medication. The NNT is the average number of patients who need to be treated to prevent one additional bad outcome. It is defined as the inverse of the absolute risk reduction, and computed as 1 / ( I u − I e ) {\displaystyle 1/(I_{u}-I_{e})} , where I u {\displaystyle I_{u}} is the incidence in the control (unexposed) group, and I e {\displaystyle I_{e}}...

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