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Using the number needed to treat in clinical practice
Douglas L Weeks1, J Timothy Noteboom
1Inland Northwest Health Services, Spokane, WA 99201, USA. dweeks@regis.edu
Archives of Physical Medicine and Rehabilitation
|October 7, 2004
Summary
The number needed to treat (NNT) helps clinicians understand patient outcomes from clinical trials. This metric quantifies how many patients require treatment for one additional benefit, aiding intervention choices.
Area of Science:
- Clinical research methodology
- Biostatistics
- Evidence-based medicine
Background:
- The number needed to treat (NNT) is increasingly recognized for reporting clinical trial results.
- Dichotomous outcome measures are common in clinical trials.
- Clinicians need practical ways to interpret trial data for patient care.
Purpose of the Study:
- To describe the number needed to treat (NNT) statistic.
- To explain the utility of NNT in selecting clinical interventions.
- To highlight NNT's value in decision-making for healthcare providers.
Main Methods:
- The abstract defines the number needed to treat (NNT).
- It explains NNT as the average number of patients needing treatment for one additional good outcome or to prevent one bad outcome.
- The communication focuses on the conceptual understanding and application of NNT.
Main Results:
- NNT provides a patient-centered metric for clinical trial outcomes.
- It translates statistical results into a tangible number of patients.
- This facilitates a clearer understanding of intervention effectiveness.
Conclusions:
- The number needed to treat (NNT) is a valuable tool for clinicians.
- NNT aids in making informed decisions about specific clinical interventions.
- Understanding NNT enhances the application of evidence-based practice.