Qualitative comparison of the reliability of health status assessments with the EuroQol and SF-36 questionnaires after stroke. United Kingdom Collaborators in the International Stroke Trial

P Dorman, J Slattery, B Farrell, M Dennis, P Sandercock

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND AND PURPOSE: The reliability of the EuroQol and SF-36 questionnaires after stroke is not known. We therefore aimed to assess and compare the test-retest reliability of both instruments in a group of stroke patients.

METHODS: A total of 2253 patients with stroke entered by United Kingdom hospitals in the International Stroke Trial were randomized to follow up with either the EuroQol or the SF-36 instruments. For both instruments, we randomly selected one third of respondents and asked them to complete another, identical questionnaire. We assessed test-retest reliability using agreement statistics: unweighted kappa statistics for the categorical domains of the EuroQol and intraclass correlation coefficients for the EuroQol visual analog scale, utility scores, and SF-36.

RESULTS: For the five categorical domains of the EuroQol, reproducibility was generally good (kappa ranged from 0.63 to 0.80). The reproducibility of the domains of the SF-36 was qualitatively similar for all the domains except mental health (intraclass correlation coefficient=.28). However, the 95% confidence intervals for the difference in scores between test and retest were substantial. For both instruments, reproducibility was better when the patient completed the questionnaires than when a proxy did.

CONCLUSIONS: Both the EuroQol and SF-36 have acceptable and qualitatively similar test-retest reliability. Therefore, either instrument might function effectively as a discriminatory measure for assessing health-related quality-of-life outcomes in groups of patients after stroke. However, our data do not support the use of either instrument for serial assessments in individual patients unless very large differences over time are expected.

Original languageEnglish
Pages (from-to)63-8
Number of pages6
JournalStroke; a journal of cerebral circulation
Volume29
Issue number1
Publication statusPublished - Jan 1998

Keywords

  • Activities of Daily Living
  • Aged
  • Aged, 80 and over
  • Attitude to Health
  • Cerebrovascular Disorders
  • Confidence Intervals
  • Emotions
  • Female
  • Follow-Up Studies
  • Great Britain
  • Health Status
  • Health Status Indicators
  • Humans
  • Male
  • Mental Health
  • Middle Aged
  • Outcome Assessment (Health Care)
  • Pain
  • Quality of Life
  • Questionnaires
  • Reproducibility of Results
  • Social Adjustment
  • Time Factors

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