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Related Experiment Videos

iMPACT3: Internet-based development and administration of utility elicitation protocols.

L A Lenert1, A Sturley, M E Watson

  • 1Veterans Administration Healthcare System, San Diego, CA 92161, USA. llenert@ucsd.edu

Medical Decision Making : an International Journal of the Society for Medical Decision Making
|December 3, 2002
PubMed
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iMPACT3 software facilitates health state utility data collection in research. While showing good validity and consistency, its test-retest reliability needs further improvement for optimal use.

Area of Science:

  • Health economics
  • Psychometrics
  • Software engineering

Background:

  • Collecting health state utility data is crucial for health economic evaluations.
  • Existing methods for utility elicitation can be resource-intensive and complex.
  • The Internet Multimedia Preference Assessment Instrument Construction Tool (iMPACT3) offers a potential solution for streamlining this process.

Purpose of the Study:

  • To evaluate the feasibility and psychometric properties of the iMPACT3 software in generating utility elicitation protocols.
  • To assess the construct validity, internal consistency, and test-retest reliability of protocols developed using iMPACT3.

Main Methods:

  • iMPACT3, a free, web-based software, was used by researchers to build custom utility elicitation protocols by selecting and tailoring modular components.

Related Experiment Videos

  • A study involving 75 HIV-infected patients was conducted using an iMPACT3-generated protocol.
  • Psychometric properties including construct validity, internal consistency, and test-retest reliability were analyzed.

    • Main Results:

    • The iMPACT3-generated protocol demonstrated substantial construct validity and good internal consistency.
    • Logic error rates ranged from 4% to 10%, and procedural invariance error rates ranged from 10% to 28%.
    • Test-retest reliability was fair, with intraclass correlation coefficients between 0.42 and 0.55 over 3- to 6-week intervals.

    Conclusions:

    • iMPACT3 is a feasible tool for facilitating the collection of health state utility data.
    • Further refinement of specific utility assessment procedures within iMPACT3 may enhance reliability.
    • The software shows promise for researchers needing to develop and deploy utility elicitation instruments efficiently.