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Related Experiment Videos

Number needed to treat (or harm).

Martin R Tramèr1, Bernhard Walder

  • 1Division of Anesthesiology, Department APSIC, Geneva University Hospitals, Geneva, Switzerland. martin.tramer@hcuge.ch

World Journal of Surgery
|April 14, 2005
PubMed
Summary
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The number needed to treat (NNT) provides a more meaningful measure of treatment effectiveness than relative terms. This absolute measure accounts for underlying risk, indicating how well an intervention works and the effort required for a specific outcome.

Area of Science:

  • Clinical Epidemiology
  • Biostatistics

Background:

  • Treatment effects are often reported using relative measures, which can be misleading for clinical decision-making.
  • Absolute measures provide a clearer understanding of a treatment's impact by considering the baseline risk.

Purpose of the Study:

  • To advocate for the use of absolute risk reduction and the number needed to treat (NNT) as standard summary estimates in clinical research.
  • To highlight the importance of NNT in quantifying treatment efficacy and guiding healthcare professionals.

Main Methods:

  • The abstract discusses the concept of number needed to treat (NNT) as the reciprocal of absolute risk reduction.
  • Emphasizes the necessity of contextual information accompanying NNT, including intervention details, control, observation period, baseline risk, and endpoint definition.

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Main Results:

  • The number needed to treat (NNT) is a powerful, interpretable metric that reflects the actual benefit of an intervention.
  • NNT accounts for the underlying risk of the study population, offering a more rational basis for decision-making.
  • Reporting NNT with confidence intervals and considering both benefit and harm provides a comprehensive view of an intervention's utility.

Conclusions:

  • Absolute risk reduction and NNT are superior to relative measures for assessing treatment effects.
  • NNT should be routinely reported in randomized controlled trials, accompanied by essential contextual data and confidence intervals.
  • Comprehensive reporting of NNT for both benefits and harms is crucial for informed clinical practice and patient care.