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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

Summary

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.

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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.
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.