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Related Experiment Videos

Testing subject comprehension of utility questionnaires.

Deborah G Dobrez1, Elizabeth A Calhoun

  • 1Center on Outcomes, Research and Education, Evanston Northwestern Healthcare, USA. d-dobrez@northwestern.edu

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation
|April 17, 2004
PubMed
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Utility questionnaires, like the standard gamble (SG) and time trade-off (TTO), can be challenging. Pilot tests suggest comprehension checks can identify and potentially improve data reliability for subjects struggling with health utility assessments.

Area of Science:

  • Health Economics
  • Patient-Reported Outcomes
  • Psychometrics

Background:

  • Utility questionnaires are crucial for health economics and outcomes research.
  • Subject comprehension of these instruments is often a concern, potentially impacting data validity.
  • Direct measurement of subject comprehension has not been widely explored.

Purpose of the Study:

  • To pilot test novel comprehension tests for health utility questionnaires.
  • To determine if subject comprehension of utility instruments can be directly measured.
  • To assess the impact of comprehension difficulties on health utility data.

Main Methods:

  • Pilot study involving 31 subjects assessing current health utilities via standard gamble (SG), time trade-off (TTO), and visual analog scale.

Related Experiment Videos

  • Subjects were randomized to one of two comprehension tests: logical consistency checks or evaluation of hypothetical respondent utilities.
  • Health states evaluated included being blind and wearing glasses.

    • Main Results:

    • No subjects exhibited inconsistent rankings in the logical consistency test.
    • Five subjects (17%) incorrectly judged hypothetical respondents' utilities, indicating comprehension issues.
    • Subjects with lower utility scores (below the first decile) and those who failed the hypothetical respondent test reported significantly lower current health utilities.

    Conclusions:

    • A minority of subjects may experience difficulties understanding utility questionnaires.
    • Comprehension checks are a viable method for directly measuring subject understanding.
    • Incorporating comprehension checks into training or analysis may enhance the reliability of health utility data.