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

Joseph T. King, Mindi A. Styn, Joel Tsevat and Mark S. Roberts

Medical Decision Making, 2003, vol. 23, issue 3, 212-225

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

Date: 2003
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Persistent link: https://EconPapers.repec.org/RePEc:sae:medema:v:23:y:2003:i:3:p:212-225

DOI: 10.1177/0272989X03023003003

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