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Related Experiment Videos

The reliability and internal consistency of an Internet-capable computer program for measuring utilities.

L A Lenert1

  • 1Section on Health Services Research, Veterans Affairs Medical Center, San Diego, CA 92161, USA. llenert@ucsd.edu

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation
|April 12, 2001
PubMed
Summary

The iMPACT2 computer program reliably measures patient utilities for health states, showing high internal consistency. This internet-based tool facilitates utility measurements in clinical trials and patient decision support.

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Area of Science:

  • Health outcomes research
  • Health economics
  • Psychometrics

Background:

  • Assessing patient utilities is crucial for clinical trials and decision support.
  • Internet-based tools offer potential for efficient and accessible utility measurement.

Purpose of the Study:

  • To evaluate the reliability and internal consistency of the iMPACT2 program for measuring patient utilities.
  • To determine if internet-based utility assessment is feasible and accurate.

Main Methods:

  • The Internet Multimedia Preference Assessor Construction Tool (iMPACT2) was implemented using web technologies.
  • Sixty healthy volunteers completed utility assessments using iMPACT2 (visual analog scale and standard gamble) on two occasions.
  • The Short Form-12 (SF-12) health questionnaire was used for comparison.

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Main Results:

  • iMPACT2 demonstrated reliable measurements for current health utilities (ICC 0.82-0.84), comparable to SF-12 scales.
  • High internal consistency was observed, with 94% of subjects showing consistent preference ratings.
  • Subjects could effectively discriminate between hypothetical health states using the program.

Conclusions:

  • The iMPACT2 program reliably measures standard gamble utilities with high internal consistency.
  • Internet-based utility assessment procedures are feasible and can be translated from desktop programs.
  • Further research is needed to compare iMPACT2 with traditional interviewer-administered methods.