Item-level psychometrics of the Glasgow Outcome Scale: Extended structured interviews

Ickpyo Hong, Chih Ying Li, Craig A. Velozo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The Glasgow Outcome Scale-Extended (GOSE) structured interview captures critical components of activities and participation, including home, shopping, work, leisure, and family/friend relationships. Eighty-nine community dwelling adults with mild-moderate traumatic brain injury (TBI) were recruited (average = 2.7 year post injury). Nine items of the 19 items were used for the psychometrics analysis purpose. Factor analysis and item-level psychometrics were investigated using the Rasch partial-credit model. Although the principal components analysis of residuals suggests that a single measurement factor dominates the measure, the instrument did not meet the factor analysis criteria. Five items met the rating scale criteria. Eight items fit the Rasch model. The instrument demonstrated low person reliability (0.63), low person strata (2.07), and a slight ceiling effect. The GOSE demonstrated limitations in precisely measuring activities/participation for individuals after TBI. Future studies should examine the impact of the low precision of the GOSE on effect size.

Original languageEnglish (US)
Pages (from-to)65-73
Number of pages9
JournalOTJR Occupation, Participation and Health
Issue number2
StatePublished - Apr 2016
Externally publishedYes


  • Measurement
  • Participation
  • Psychometrics
  • Rasch analysis

ASJC Scopus subject areas

  • Occupational Therapy


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