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Journal of Health Psychology
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Assessing Unrealistic Optimism

Impact of Different Approaches to Measuring Susceptibility to Diabetes

David Hevey

Trinity College, Dublin, Ireland, heveydt{at}tcd.ie

David P. French

Coventry University, UK

Theresa M. Marteau

King's College, London, UK

Stephen Sutton

University of Cambridge, UK

The effects of measurement method on levels of unrealistic optimism for developing diabetes were examined in 323 UK adults. A mixed factorial design comprised direct and indirect measures of unrealistic optimism as the within-subjects variable, and between-subjects manipulations of the order of direct versus indirect assessment, the order of self—other comparison, the number of response options used and the polarity of the ratings. More unrealistic optimism was obtained using the direct method and using unipolar scales, and/or with the self—other order in the indirect method. The results indicate that levels of unrealistic optimism depend on its assessment method.

Key Words: assessment • diabetes • risk perception • unrealistic optimism

Journal of Health Psychology, Vol. 14, No. 3, 372-377 (2009)
DOI: 10.1177/1359105308101675
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