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Quality of Life Research

, Volume 14, Issue 3, pp 611–627 | Cite as

Change in quality of life of people with stroke over time: True change or response shift?

  • Sara AhmedEmail author
  • Nancy E. Mayo
  • Marc Corbiere
  • Sharon Wood-Dauphinee
  • James Hanley
  • Robin Cohen
Article

Abstract

In many studies, assessments of change in self-report measures such as health-related quality of life must account for potential response shift, including reconceptualization and changes in internal standards of measurement. Objective: The objective of our study was to compare healthy controls and individuals with stroke on the extent to which changes in internal standards and reconceptualization of health related quality of life (HRQL) occurs over the first 6 months post-stroke. Methods: Confirmatory factor analysis was used to assess invariance of the SF-36 measurement model over time among 238 individuals with stroke and 392 controls, separately. This procedure assessed changes over time in the factor loadings, variances, and covariances of responses, and compared the extent of change between individuals with stroke and those in the control group. In addition a multisample comparison was made between individuals with stroke and members of the control group at the first evaluation in order to assess invariance of the SF-36 measurement model between the groups. The controls were considered to be a ‘proxy’ for the stroke cohort prior to the stroke. Results: We found no evidence of reconceptualization and changes in internal standards over time when the groups were assessed separately. There was a significant difference in the factor covariances (reconceptualization) between the two groups at the time of the first evaluation. However, measurement error was also significant for this comparison. Conclusion: This study indicates that the improvement in HRQL over time is real rather than a result of reconceptualization or a recalibration. If response shift does occur with stroke it is likely to be mediated by the event itself and not the recovery process.

Keywords

Change Confirmatory factor analysis Health-related quality of life outcomes Response shift Stroke 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Sara Ahmed
    • 1
    • 13
    Email author
  • Nancy E. Mayo
    • 2
    • 3
  • Marc Corbiere
    • 4
  • Sharon Wood-Dauphinee
    • 5
    • 6
    • 7
  • James Hanley
    • 8
    • 9
  • Robin Cohen
    • 10
    • 11
    • 12
  1. 1.Department of Epidemiology and Biostatistics, Faculty of MedicineMcGill UniversityQuebecCanada
  2. 2.Division of Clinical EpidemiologyRoyal Victoria HospitalQuebec Canada
  3. 3.Faculty of Medicine, School of Physical and Occupational TherapyMcGill UniversityCanada
  4. 4.Michael Smith Foundation for Health ResearchUniversity of British ColumbiaCanada
  5. 5.School of Physical and Occupational TherapyCanada
  6. 6.Faculty of Medicine, Department of Epidemiology and BiostatisticsMcGill UniversityCanada
  7. 7.Division of Clinical EpidemiologyRoyal Victoria HospitalCanada
  8. 8.Division of Clinical EpidemiologyRoyal Victoria HospitalCanada
  9. 9.Department of Epidemiology and BiostatisticsMcGill UniversityCanada
  10. 10.National Cancer Institute of Canada and Canadian Institutes of Health ResearchCanada
  11. 11.Departments of Oncology and MedicineMcGill UniversityCanada
  12. 12.McGill University Health Center Medical ScientistCanada
  13. 13.Division of Clinical Epidemiology Royal Victoria HospitalQuebecCanada

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