Web Survey Bibliography
Title The reliability and internal consistency of an Internet-capable computer program for measuring utilities
Author Lenert, L. A.
Source Quality of Life Research, 9, 7, pp. 811-817
Database Kluwer Journals
Access date 20.07.2004
Abstract Objective: The purpose of this study was to assess the reliability and internal consistency of measurements of utilities performed with a computer program (iMPACT2) designed for Internet surveys and Internet patient decision-support systems. Methods: We implemented the Internet Multimedia Preference Assessor Construction Tool, version 2 (iMPACT2) program using the combination of a web server, HTML files, and a web-accessible database. The program randomized subjects, screened their responses for missing data and failures of internal consistency, assisted patients with resolving certain inconsistencies, and, upon a subject's completion of the protocol, provided a report of results to the research assistant administering the program. To validate the iMPACT2 program, we recruited 60 healthy community volunteers and elicited preferences in a research-lab setting using a visual analog scale (VAS) and the standard gamble (SG) for subject's current health and three hypothetical states. For purposes of comparison, we also administered a Short Form-12 (SF-12) health-assessment questionnaire. Subjects used the computer software on two occasions separated by 2–4 weeks of time. Results: Visual analog scale and standard gamble ratings for subjects' current health were reliable (intraclass correlation coefficient (ICC) of 0.82 and 0.84 (two outliers excluded - 0.60 without exclusions), respectively) were comparable with the reliability of the Physical and Mental Component scales of the SF-12 (ICCs of 0.84 and 0.75, respectively). Subjects could easily discriminate between hypothetical states (D scores 0.74 for SG and 0.90 for VAS), and 94% had a completely internally consistent ordering of preference ratings for states. Conclusions: iMPACT2 produces measurements of standard gamble utilities that are reliable and have a high degree of internal consistency. Procedures for assessment of utilities developed for desktop computer programs can be translated to software designed for the Internet, facilitating the use of utilities and endpoints in clinical trials and development of web-based decision-support applications for patients. However, further testing, including direct comparisons with traditional interviewer administered utility elicitation protocols, is needed.
Access/Direct link Kluwer Journals (full text)
Year of publication2000
Bibliographic typeJournal article
Web Survey Bibliography - Quality of Life Research (7)
- Kids' Life and Times: using an Internet survey to measure children's health-related quality...; 2011; Lloyd, K.
- The impact of next and back buttons on time to complete and measurement reliability in computer-based...; 2010; Gershon, R. C. et al.
- Feasibility, reliability, and validity of adolescent health status measurement by the Child Health Questionnaire...; 2006; Raat, H., Mangunkusumo, R. T., Landgraf, J. M., Kloek, G., Brug, J.
- Development of a Pain and Discomfort Module for Use with the WHOQOL-100; 2004; Mason, V. L., Skevington, S. M., Osborn, M.
- The effect of different methods of collecting data: Mail, telephone and filter data collection issues...; 2003; Hawthorne, G.
- The reliability and internal consistency of an Internet-capable computer program for measuring utilities...; 2000; Lenert, L. A.
- Feasibility of quality-of-life research on the Internet: A follow-up study; 1999; Treadwell, J. R., Soetikno, R. M., Lenert, L. A.