A randomised comparison of the EuroQol and Short Form-36 after stroke

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Abstract
We included all patients who had been entered by United Kingdom centres in the International Stroke Trial between 2 March 1993 and 31 May 1995 who were not known to be dead. We randomised eligible patients using an allocation code generated by an adaptive randomisation algorithm (minimisation) (4) to postal follow up with either the EuroQol or the SF-36 instrument. We incorporated both instruments into questionnaire booklets which also asked for the patient's address, type of residence, functional outcome after stroke, and whether or not the patient completed the form independently. We posted the booklets with a personalised letter explaining the purpose of the study and a reply paid envelope. We asked subjects to complete the questionnaire without help if possible, and, if they could not, to give it to a relative or carer willing to respond for them. A reminder letter and questionnaire were sent after two weeks. The primary measures of outcome for each instrument were: the frequency of response after the first mailing and the reminder and the number of forms with “no domains of missing data.” The study was powered (power =0.95=(1-ß),α=0.05) to detect an absolute difference in overall response of 5%—that is, of 50 forms per 1000 between the two groups, assuming an overall mean response of 75%.

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