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Journal of Hospital Medicine· 2026Q1

Understanding and interpreting composite outcomes in clinical research

Mari Takashima, Brett Dyer, Amanda Ullman, Robert S. Ware

Short summary

Composite outcomes, which combine multiple endpoints into a single measure, can increase statistical power but present interpretive challenges due to varying clinical importance, frequency, and treatment effects across components.

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Key points

  • Composite outcomes merge multiple clinical endpoints into one measure.
  • They can enhance statistical power for detecting treatment effects.
  • Interpretation is challenging due to variations in component clinical importance, frequency, and treatment effect.
  • Guidelines are provided for designing, analyzing, and interpreting studies using composite endpoints.

AI-generated from the title and abstract; the full text is not read.

Abstract

Abstract Composite outcomes combine multiple endpoints into a single measure. They can capture overall treatment effects and increase statistical power, but have important interpretive challenges. Components of the outcome may vary in clinical importance, frequency, and treatment effect. This Progress Note describes three types of composite outcomes used in clinical research, discusses challenges in interpretation, including when outcomes are dominated by less important components and when treatment effects diverge across components. Practical guidelines for designing, analyzing, and interpreting studies that use composite endpoints are presented. Understanding these principles will help clinicians critically evaluate studies with composite outcomes.

The authors' abstract, as published at the source. Journal of Hospital Medicine, 2026 · DOI ↗

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Statistics, Probability and UncertaintyDecision Sciences