Psychometric properties of the RAND-36 among three chronic disease (multiple sclerosis,rheumatic diseases and COPD) in the Netherlands |
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Authors: | Moorer P Suurmeijer ThPBM Foets M Molenaar IW |
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Institution: | (1) Northern centre for Healthcare Research (NCH), University of Groningen, The Netherlands;(2) Interuniversity Centre for Social Science Theory and Methodology (ICS), University of Groningen, The Netherlands;(3) NIVEL, University of Groningen, Utrecht, The Netherlands;(4) Department of statistics, Measurement Theory and Information, Univeristy of Groningen, The Netherlands |
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Abstract: | Objective: In this article, psychometric properties both of the total RAND-36 and of its subscales, such as unidimensionality, differential
item functioning (DIF or item bias), homogeneity and reliabilities, are examined. Methods: The data from populations with three chronic illnesses, multiple sclerosis (n = 448), rheumatism (n = 336) and COPD (n =
259), have been collected in different parts of the Netherlands. The main technique used was Mokken scale analysis for polytomous
items. Results: All subscales of the RAND-36 appeared to be unidimensional. For the sub scales ‘mental health’ and ‘general health perceptions’
some minor indications of DIF for the different chronic illnesses were found. Reliabilities of almost all subscales in all
subpopulations were higher than 0.80, while the homogeneities of almost all subscales in all subpopulations were higher than
0.50, indicating ‘strong unidimensional, hierarchical scales’. Conclusions: In general, the subscales of the RAND-36 can be used to compare persons with different chronic illnesses. The subscale ‘general
health perceptions’ did not function as well as would be preferred.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Psychometrics Quality of life RAND-36> |
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