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Number Needed to Treat (NNT), Relative Risk Reduction (RRR, Relative Risk Difference) and Absolute Risk Reduction (ARR, Absolute Risk Difference)

Purpose:

To use the number needed to treat for looking at the benefits of therapy to prevent a given condition from occurring during a time period.

Specialty:

General content (available to all)

Objective:

other testing

ICD-10:

Description:

The number needed to treat (NNT) is a simple method of looking at the benefit of a treatment intervention to prevent a condition or complication. It is the inverse of the absolute risk reduction for the treated versus untreated control populations. It can be used to extrapolate findings in the literature to a given patient at an arbitrary specified baseline risk when the relative risk reduction associated with treatment is constant for all levels of risk.

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