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Disease-specific quality of life: is it one construct?
A G de Boer1, R J Spruijt, M A Sprangers
1Department of Medical Psychology, Academic Medical Center, University of Amsterdam, The Netherlands. A.G.deboer@amc.uva.nl
Summary
This study found that disease-specific quality of life (QoL) can be viewed as a single construct for both inflammatory bowel disease (IBD) and Parkinson
Area of Science:
- Psychometrics
- Health Outcomes Research
- Chronic Disease Management
Background:
- Quality of Life (QoL) is a critical aspect of chronic disease management.
- Understanding the underlying structure of disease-specific QoL is essential for accurate measurement.
- Previous models of QoL have varied, necessitating examination of its construct validity.
Purpose of the Study:
- To investigate the structural properties of disease-specific quality of life (QoL).
- To compare QoL structures across two distinct chronic conditions: inflammatory bowel disease (IBD) and Parkinson's disease (PD).
- To assess the stability of QoL structures over time.
Main Methods:
- Employed structural equation modelling (SEM) to test QoL models.
- Analyzed factor loadings to establish relationships between QoL constructs and dimensions.
- Conducted longitudinal analysis using data collected in 1994 and 1995 from IBD and PD patients.
Main Results:
- Disease-specific QoL was consistently represented as a single construct for both IBD and PD.
- The structure of QoL models demonstrated satisfactory stability over the one-year study period.
- Parkinson's disease showed stable factor loadings, while inflammatory bowel disease exhibited more fluctuation over time.
Conclusions:
- A single, meaningful sum score can be reliably derived from disease-specific QoL questionnaires for IBD and PD.
- The findings support the use of unified QoL measures in clinical research and practice for these conditions.
- The structural stability of QoL differs between inflammatory bowel disease and Parkinson's disease.