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The added value of ordinal analysis in clinical trials: an example in traumatic brain injury

Research output: Contribution to journalArticle

  • Bob Roozenbeek
  • Hester F Lingsma
  • Pablo Perel
  • Phil Edwards
  • Ian Roberts
  • Gordon D Murray
  • Andrew Ir Maas
  • Ewout W Steyerberg
  • IMPACT (International Mission on Prognosis and Clinical Trial Design in Traumatic Brain Injury) Study Group

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    Rights statement: © 2011 Roozenbeek et al.; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Original languageEnglish
Pages (from-to)R127
JournalCritical Care
Issue number3
Publication statusPublished - 17 May 2011


In clinical trials, ordinal outcome measures are often dichotomized into two categories. In traumatic brain injury (TBI) the 5-point Glasgow outcome scale (GOS) is collapsed into unfavourable versus favourable outcome. Simulation studies have shown that exploiting the ordinal nature of the GOS increases chances of detecting treatment effects. The objective of this study is to quantify the benefits of ordinal analysis in the real-life situation of a large TBI trial.

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