Number needed to treat (revision 1)
Old revision·09:00, 29 Sep 2024·Chromatokid
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| Number needed to treat | |
|---|---|
| Abbreviation | NNT |
| Definition | Reciprocal of the absolute risk reduction |
| Requires | A stated time horizon |
| Counterpart | Number needed to harm |
| Topic infobox · conventions | |
The number needed to treat (NNT) is the number of people who must receive a treatment, rather than the comparator, for one additional person to experience the benefit over a defined period. It is the reciprocal of the absolute risk reduction.[1]
Its value is that it expresses effect on an absolute scale. A relative risk reduction of 20% describes a large benefit where the baseline risk is high and a negligible one where it is low; the number needed to treat carries the baseline risk within it.[1]
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