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“Perfect Health†versus “Disease Free†: The Impact of Anchor Point Choice on the Measurement of Preferences and the Calculation of Disease-Specific Disutilities

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  • Joseph T. King Jr.
  • Mindi A. Styn
  • Joel Tsevat
  • Mark S. Roberts

Abstract

Background. During preference testing, some investigators use “perfect health†as the upper anchor point of their measurement scale (“ Q scale†), whereas others use “disease free†(“ q scale†), which can confound the interpretation and comparison of study results. Methods. We measured current health preferences among 74 patients with cervical spondylotic myelopathy (CSM) on both the Q and q scales using the visual analogue scale (VAS), standard gamble (SG), time tradeoff (TTO), and willingness to pay (WTP). Results. There were significant differences in mean Q and q scale values for the VAS, SG, and WTP (for all, P

Suggested Citation

  • Joseph T. King Jr. & Mindi A. Styn & Joel Tsevat & Mark S. Roberts, 2003. "“Perfect Health†versus “Disease Free†: The Impact of Anchor Point Choice on the Measurement of Preferences and the Calculation of Disease-Specific Disutilities," Medical Decision Making, , vol. 23(3), pages 212-225, May.
    • Handle: RePEc:sae:medema:v:23:y:2003:i:3:p:212-225
    DOI: 10.1177/0272989X03023003003
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    References listed on IDEAS

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    1. Alan Diener & Bernie O'Brien & Amiram Gafni, 1998. "Health care contingent valuation studies: a review and classification of the literature," Health Economics, John Wiley & Sons, Ltd., vol. 7(4), pages 313-326, June.
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