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The win ratio approach for composite endpoints: practical guidance based on previous experience.

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European Heart Journal
|September 9, 2020
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The win ratio method enhances cardiovascular (CV) trial analysis by prioritizing diverse outcomes, offering greater statistical power. This guide details its design and reporting, including sample size determination for clinical trials.

Keywords:
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Area of Science:

  • Clinical Trials Methodology
  • Cardiovascular Research
  • Statistical Analysis

Background:

  • The win ratio, introduced in 2012, is a statistical method for analyzing composite endpoints in clinical trials.
  • It has gained widespread adoption in cardiovascular (CV) trials due to its ability to handle hierarchical and diverse outcome types.
  • Conventional methods for composite endpoints have limitations in accounting for outcome priorities and integrating different data types.

Purpose of the Study:

  • To provide practical guidance on designing and reporting clinical trials using the win ratio approach.
  • To offer insights into implementing the win ratio, including sample size calculations.
  • To explain the principles behind the win ratio for better understanding and application in cardiovascular research.

Main Methods:

  • Overview of the win ratio principles, emphasizing its handling of hierarchical composite endpoints.
  • Discussion on incorporating various outcome types, including time-to-event and count data (e.g., CV-related hospitalizations).
  • Exploration of the win ratio's statistical power advantages over traditional methods.

Main Results:

  • The win ratio effectively utilizes all information from component outcomes, increasing statistical power.
  • It allows for the combination of different types of outcomes (e.g., mortality and hospitalizations) into a single endpoint.
  • The method can also integrate quantitative outcomes like exercise test results or quality-of-life scores.

Conclusions:

  • The win ratio offers a statistically powerful and flexible approach for analyzing composite endpoints in CV trials.
  • Practical guidance is needed for optimal implementation in trial design, sample size determination, and reporting.
  • This manuscript serves as a resource for researchers seeking to leverage the win ratio in cardiovascular clinical trials.