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Improving the measurement of quality of life in older people: the York SF-12

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JournalQJM Monthly Journal of the Association of Physicians
DatePublished - Dec 2001
Issue number12
Volume94
Number of pages4
Pages (from-to)695-698
Original languageEnglish

Abstract

To assess whether changing the layout of the SF-12 affected item response rates, we tested two SF-12 formats in a quasi-randomized trial of women aged greater than or equal to 70 years in two general practices in North Yorkshire. The modified version of the SF-12 ('York SF-12') converted the 'stem and leaf' format of some questions to individual items. We assessed the effect of the two types of questionnaires on item response rates. The difference in overall response rates to the two questionnaires (York SF-12 26.8%; SF-12 29.5%) was not statistically significant (95%Cl -1.88% to 7.22%). However, the modified SF-12 had a statistically significantly lower item non-response rate of 8.5%, compared with the 26.6% of the SF-12 (95%Cl 11.1%-25.1%). Chronbach's alpha reliability scores for the York SF-12 were also slightly better than for the older version. The York version of the SF-12 is an improvement on the original questionnaire. We recommend that the York SF-12 be used in preference to the SF-12 when surveying an older population.

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