Dimensional structure of the SF-36 in neurological patients

Items were considered to load on (were related to) a factor if factor loadings exceeded 0.40 on that factor and were lower on the other factors. Because all items had ordinal scores and several subscale scores showed a skewed distribution, PCA was carried out using polychoric correlations instead of...

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Bibliographic Details
Published in:Journal of clinical epidemiology 2006-05, Vol.59 (5), p.541-543
Main Authors: Dallmeijer, A.J., Dekker, J., Knol, D.L., Kalmijn, S., Schepers, V.P.M., de Groot, V., Lindeman, E., Beelen, A., Lankhorst, G.J.
Format: Article
Language:English
Subjects:
Amyotrophic lateral sclerosis
Amyotrophic Lateral Sclerosis - physiopathology
Biological and medical sciences
Epidemiology
Follow-Up Studies
General aspects
Health Status Indicators
Humans
Medical research
Medical sciences
Mental health
Methodology
Multiple Sclerosis - physiopathology
Nervous System Diseases - physiopathology
Principal Component Analysis - methods
Principal components analysis
Psychometrics
Public health. Hygiene
Public health. Hygiene-occupational medicine
Quality of Life
Stroke
Stroke - physiopathology
Studies
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Summary:Items were considered to load on (were related to) a factor if factor loadings exceeded 0.40 on that factor and were lower on the other factors. Because all items had ordinal scores and several subscale scores showed a skewed distribution, PCA was carried out using polychoric correlations instead of Pearson correlations [11]. Other authors also found proportions of explained variance below 60% and deviating factor contents for the subscales with the physical and mental summary scores in patients with MS (9), stroke (8), and ALS (10) and raised questions about the use of the SF-36 summary scales in these populations.
ISSN:0895-4356
1878-5921
DOI:10.1016/j.jclinepi.2005.11.001