Computerized adaptive testing in back pain: validation of the CAT-5D-QOL
Jacek A Kopec1, Maziar Badii, Mario McKenna
1Department of Health Care and Epidemiology, University of British Columbia, Vancouver, BC, Canada. jkopec@arthritisresearch.ca
Spine
|May 23, 2008
Summary
A new computerized adaptive test (CAT) effectively measures health-related quality of life in back pain patients. This validated tool (CAT-5D-QOL) is reliable, valid, and efficient, improving outcome assessment in research.
Area of Science:
- Health Outcomes Research
- Psychometrics
- Digital Health
Background:
- Item response theory-based item banks for 5 health-related quality of life (HRQL) domains relevant to back pain were developed.
- These domains include Daily Activities (DAILY), Walking (WALK), Handling Objects (HAND), Pain or Discomfort (PAIN), and Feelings (FEEL).
Purpose of the Study:
- To develop a computerized adaptive test (CAT) to measure 5 domains of HRQL.
- To assess the feasibility, reliability, validity, and efficiency of the CAT-5D-QOL in back pain patients.
Main Methods:
- An adaptive algorithm was implemented in a web-based questionnaire system.
- The study involved outpatients with mechanical back pain, utilizing the CAT-5D-QOL, Modified Oswestry Disability Index (MODI), Roland-Morris Disability Questionnaire (RMDQ), and SF-36 Health Survey.
Main Results:
- The CAT-5D-QOL demonstrated good reliability (0.83-0.92) and low ceiling effects.
- Scales correlated as anticipated with other HRQL measures and showed good discrimination.
- Patients answered an average of 5.2 items per scale, indicating efficiency.
Conclusions:
- The CAT-5D-QOL is a feasible, reliable, valid, and efficient tool for assessing back pain patients.
- This methodology can enhance outcome assessment, facilitate cross-study comparisons, and reduce patient burden in back pain research.
