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Introducing the fragility index-A case study using the Term Breech Trial.

Adrienne K Ho1, Kristen E Zamperoni2, Anthony M H Ho3

  • 1Department of Public Health Sciences (Epidemiology), Queen's University School of Medicine, Kingston, Ontario, Canada.

Birth (Berkeley, Calif.)
|December 28, 2022
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This summary is machine-generated.

The fragility index (FI) measures how likely a study

Keywords:
Term Breech Trialfragility index

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Area of Science:

  • Clinical Trials
  • Biostatistics
  • Medical Research Methodology

Background:

  • Statistical significance in clinical studies is crucial for decision-making.
  • The fragility index (FI) offers a method to assess the robustness of statistically significant findings.
  • Existing metrics like drop-out rates and protocol violations provide some insight into trial stability.

Purpose of the Study:

  • To introduce and explain the concept of the fragility index (FI).
  • To illustrate the application of FI using the Term Breech Trial (TBT) as a case study.
  • To discuss the implications of FI in the context of clinical trial data interpretation.

Main Methods:

  • Defined the fragility index (FI) as the minimum number of outcome changes needed to lose statistical significance (P-value >0.05).
  • Applied the FI calculation to the published results of the Term Breech Trial (TBT).
  • Compared the calculated FI with reported protocol violations and drop-out rates in the TBT.

Main Results:

  • The fragility index (FI) for the Term Breech Trial (TBT) was calculated to be 21.
  • This FI value is notably smaller than the hundreds of protocol violations reported in the TBT.
  • The TBT results, favoring cesarean birth for term breech presentation, showed a relatively low FI.

Conclusions:

  • A low fragility index (FI), especially when compared to protocol deviations, may indicate less stable trial results.
  • The routine use of FI could encourage greater skepticism and critical evaluation of clinical trial data.
  • Incorporating FI into trial analysis and discussion may enhance the reliability of evidence influencing clinical practice.