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Number needed to treat (NNT).
1Emergency Medicine and Trauma Center, Methodist Hospital, Clarian Health Partners, Indiana University School of Medicine, Indianapolis, IN, USA.
Annals of Emergency Medicine
|March 27, 1999
Summary
Number Needed to Treat (NNT) is a crucial skill in evidence-based medicine for evaluating therapy effectiveness. It quanties the clinical effort needed for a beneficial or preventive outcome from a treatment.
Area of Science:
- Clinical Medicine
- Evidence-Based Practice
- Biostatistics
Background:
- Therapeutic decision-making is frequent in clinical practice.
- Effective evaluation of treatment efficacy is essential for patient care.
Purpose of the Study:
- To provide an overview of the Number Needed to Treat (NNT) concept.
- To explain the derivation and clinical application of NNT.
- To highlight NNT as a key evidence-based medicine skill.
Main Methods:
- Conceptual overview of NNT.
- Explanation of NNT derivation.
- Discussion of NNT application in clinical scenarios.
Main Results:
- NNT offers a practical measure for treatment impact.
- NNT quantifies the effort to achieve a positive outcome or prevent a negative one.
- NNT serves as a clinical "yardstick" for therapy evaluation.
Conclusions:
- NNT is a vital skill for clinicians applying evidence-based medicine.
- Understanding NNT aids in interpreting and applying research findings.
- NNT facilitates informed therapeutic decisions.