Correspondence to Dr Paul Dorman, Neurosciences Trials Unit, Department of Clinical Neurosciences, University of Edinburgh, Western General Hospital, Crewe Rd, Edinburgh EH4 2XU, Scotland. E-mail pd{at}skull.dcn.ed.ac.uk
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
Results—For the five categorical domains of the EuroQol,
reproducibility was generally good (
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.
© 1998 American Heart Association, Inc.
Original Contributions
Qualitative Comparison of the Reliability of Health Status Assessments With the EuroQol and SF-36 Questionnaires After Stroke
statistics for the categorical domains of the EuroQol and intraclass
correlation coefficients for the EuroQol visual analog scale, utility
scores, and SF-36. 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.
Key Words: cerebrovascular disorders outcome • observer variation • quality of life • stroke
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