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Glasgow Outcome Scale: an inter-rater reliability study

S I Anderson1, A M Housley, P A Jones

  • 1Department of Clinical Neurosciences, University of Edinburgh, Western General Hospital, Scotland.

Brain Injury
|July 1, 1993
PubMed
Summary
This summary is machine-generated.

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The reliability of the Glasgow Outcome Scale (GOS) depends on data source. Direct patient assessment by psychologists showed higher GOS reliability than general practitioner (GP) reports, highlighting the need for trained staff and relative input.

Area of Science:

  • Neuroscience
  • Clinical Psychology
  • Rehabilitation Medicine

Background:

  • The Glasgow Outcome Scale (GOS) is a crucial tool for assessing patient outcomes after brain injury.
  • Variability in GOS scoring can arise from different data collection methods.
  • Ensuring reliable GOS assessments is vital for accurate patient management and research.

Purpose of the Study:

  • To evaluate the reliability of the Glasgow Outcome Scale (GOS) when data is sourced from patients, general practitioners (GPs), and relatives.
  • To compare the consistency of GOS scores obtained through direct patient interviews versus indirect reporting.

Main Methods:

  • Eighty GOS assessments were conducted on 58 patients up to 24 months post-injury.
  • GOS scores were independently derived from: (i) psychologist interviews/testing, (ii) postal GP reports, and (iii) postal questionnaires from relatives.

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  • Statistical analysis (correlation coefficients) was used to compare the agreement between different scoring methods.

    • Main Results:

    • High agreement was found between psychologist scores and scores based on relatives' information (r = 0.79, p = 0.001).
    • Low agreement was observed between psychologist scores and GP scores (r = 0.49, p = 0.001).
    • GPs tended to overestimate patient recovery, particularly at 6 months post-injury, with only 50% agreement with psychologist assessments.

    Conclusions:

    • The reliability of the GOS is significantly influenced by the method of data acquisition.
    • Direct patient assessment by trained, independent staff yields the most reliable GOS scores.
    • When direct assessment is not feasible, utilizing information from relatives, interpreted by trained personnel, is recommended for GOS scoring.