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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.
Intuitively, the lower the number needed to harm, the worse the risk factor, with 1 meaning that every exposed person is harmed. NNH is similar to number needed to treat (NNT), where NNT usually refers to a positive therapeutic result and NNH to a detrimental effect or risk factor. Marginal metrics: NNT for an additional beneficial outcome (NNTB)
It is a specific application of the number needed to treat metric (NNT). Derivation. NNV is the inverse of the absolute risk reduction of the vaccine.
In broad usage, the "practical clinical significance" answers the question, how effective is the intervention or treatment, or how much change does the treatment cause. In terms of testing clinical treatments, practical significance optimally yields quantified information about the importance of a finding, using metrics such as effect size, number needed to treat (NNT), and preventive fraction ...
Meaning Nφ: Neutrophil: Na: sodium (from Latin natrium) NA: negative appendectomy NAAT: Nucleic Acid Amplification Test: NABS: normoactive bowel sounds NAC: n-acetyl cysteine NaCl sodium chloride (saline) NAD: no abnormality detected no apparent distress no appreciable disease (and many variations of the above) NAD + nicotinamide adenine ...
NNT could refer to: . Nan Airport, Thailand; IATA airport code NNT; The Nakai–Nam Theun National Biodiversity Conservation Area in Laos; Nassim Nicholas Taleb; Number needed to treat, an epidemiological measure
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The group exposed to treatment (left) has the risk of an adverse outcome (black) reduced by 50% (RRR = 0.5) compared to the unexposed group (right).