Reliability of ratings on the Glasgow Outcome Scales from in-person and telephone structured interviews

J Head Trauma Rehabil. 2003 May-Jun;18(3):252-8. doi: 10.1097/00001199-200305000-00003.


Objective: To determine test-retest reliability and interrater reliability for structured interviews for the Glasgow Outcome Scale (GOS) using in-person and telephone contact.

Methods: Study 1: Thirty head-injured patients were interviewed face-to-face and then reinterviewed by telephone a few days later by the same rater. Study 2: Fifty-six head-injured patients were interviewed by telephone and then face-to-face interviews were carried out by a different person up to 1 month later. Agreement between ratings on the GOS and the extended GOS (GOSE) in each of the studies was assessed using the kappa statistic weighted with quadratic weights.

Results: Values of kappa(w) for the test-retest reliability study were.92 for both GOS and GOSE, and for interrater reliability study were.85 for the GOS and.84 for the GOSE.

Conclusions: The findings indicate good test-retest and interrater reliability for the structured interviews. In most circumstances a structured interview over the telephone can provide a reliable assessment of the GOS, and can safely be substituted for in person contact.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Brain Injuries / diagnosis*
  • Brain Injuries / epidemiology
  • Brain Injuries / rehabilitation
  • Confidence Intervals
  • Data Collection
  • Disability Evaluation
  • Female
  • Glasgow Outcome Scale*
  • Humans
  • Injury Severity Score
  • Interviews as Topic
  • Male
  • Middle Aged
  • Observer Variation
  • Patient Participation
  • Psychiatric Status Rating Scales
  • Reproducibility of Results
  • Telephone
  • United Kingdom