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Evaluating Noninferiority in Clinical Trials with a Hierarchical End Point
John Gregson1,2, Bjorn Redfors3,4,5, David J Cohen3,6
1Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, UK.
NEJM Evidence
|February 24, 2026
Summary
The win ratio method helps analyze clinical trial outcomes, particularly for noninferiority trials. It provides guidance on selecting noninferiority margins and translating them into understandable metrics like rate ratios.
Area of Science:
- Clinical Trials
- Biostatistics
- Medical Research
Background:
- The win ratio is a statistical method for analyzing hierarchical outcomes in clinical trials.
- It is commonly used to evaluate intervention superiority against standard care.
- Noninferiority trials assess the effectiveness of alternative interventions post-approval.
Purpose of the Study:
- To explain how to select appropriate noninferiority margins using the win ratio.
- To emphasize translating win ratio margins into familiar metrics (e.g., rate ratios, mean differences).
- To provide practical guidance for using the win ratio in future noninferiority trials.
Main Methods:
- The study focuses on the application of the win ratio in noninferiority trial design.
- It details the process of selecting a noninferiority margin based on the win ratio.
- A hypothetical trial is used to illustrate the framework and its interpretation.
Main Results:
- The win ratio offers a structured approach to defining noninferiority margins.
- Translating win ratio margins into rate ratios or differences in means enhances interpretability.
- The proposed framework provides practical utility for clinical trialists.
Conclusions:
- The win ratio is a valuable tool for noninferiority trial analysis.
- Clear translation of statistical metrics into clinical terms is crucial for decision-making.
- This approach can improve the design and interpretation of future noninferiority studies.
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