Skip to main content
Top
Gepubliceerd in: Quality of Life Research 9/2013

01-11-2013

Evidence for a unidimensional 15-item version of the CASP-19 using a Rasch model approach

Auteurs: Yemi Oluboyede, Adam B. Smith

Gepubliceerd in: Quality of Life Research | Uitgave 9/2013

Log in om toegang te krijgen
share
DELEN

Deel dit onderdeel of sectie (kopieer de link)

  • Optie A:
    Klik op de rechtermuisknop op de link en selecteer de optie “linkadres kopiëren”
  • Optie B:
    Deel de link per e-mail

Abstract

Aim

The aim of this study is to explore the dimensionality of the CASP-19—a quality-of-life measure for early old age—and to assess the stability of the item locations over time and changes in person measures.

Methods

The Rasch partial credit model was applied to the CASP-19 data obtained from Waves 1 and 3 (N = 9,407 and N = 7,732) of the English Longitudinal Study of Ageing to assess item fit, dimensionality and differential item functioning (DIF).

Results

Five items demonstrated category disordering for the last two response categories of the CASP-19 (which were collapsed), and 4 items demonstrated item misfit and were removed from the analysis. Cronbach’s alpha indicated good internal consistency for both waves (0.87 for Wave 1 and 0.88 for Wave 3). There was no evidence of multidimensionality, and no significant DIF was observed for gender. When the two datasets were combined, no statistically significant differences were observed between the two sets of item locations. A statistically significant difference was found for the mean person measure [t(5,524) = 17.88, p < 0.001)], suggesting quality of life improves as people age.

Conclusion

A 15-item unidimensional factor structure was observed for the CASP-19, which was stable over time.
Literatuur
2.
go back to reference Hyde, M., Wiggins, R. D., Higgs, P., & Blane, D. B. (2003). A measure of quality of life in early old age: The theory, development and properties of a needs satisfaction model (CASP-19). Aging & Mental Health, 7(3), 186–194.CrossRef Hyde, M., Wiggins, R. D., Higgs, P., & Blane, D. B. (2003). A measure of quality of life in early old age: The theory, development and properties of a needs satisfaction model (CASP-19). Aging & Mental Health, 7(3), 186–194.CrossRef
3.
go back to reference Howel, D. (2012) Interpreting and evaluating the CASP-19 quality of life measure in older people. Age Ageing, 41(5), 612–617. Howel, D. (2012) Interpreting and evaluating the CASP-19 quality of life measure in older people. Age Ageing, 41(5), 612–617.
4.
go back to reference Grant, R., & Bowling, A. (2011). Challenges in comparing the quality of life of older people between ethnic groups, and the implications for national well-being indicators: a secondary analysis of two cross-sectional surveys. Health and Quality of Life Outcomes, 5(9), 109.CrossRef Grant, R., & Bowling, A. (2011). Challenges in comparing the quality of life of older people between ethnic groups, and the implications for national well-being indicators: a secondary analysis of two cross-sectional surveys. Health and Quality of Life Outcomes, 5(9), 109.CrossRef
5.
go back to reference Wiggins, R. D., Netuveli, R. D., Hyde, G. M., Higgs, P., & Blane, P. (2008). The evaluation of a self-enumerated scale of quality of life (CASP-19) in the context of research on ageing: A combination of exploratory and confirmatory approaches. Social Indicators Research, 89(1), 61–77.CrossRef Wiggins, R. D., Netuveli, R. D., Hyde, G. M., Higgs, P., & Blane, P. (2008). The evaluation of a self-enumerated scale of quality of life (CASP-19) in the context of research on ageing: A combination of exploratory and confirmatory approaches. Social Indicators Research, 89(1), 61–77.CrossRef
6.
go back to reference Sim, J., Bartlam, B., & Bernard, M. (2011). The CASP-19 as a measure of quality of life in old age: evaluation of its use in a retirement community. Quality of Life Research, 20(7), 997–1004.PubMedCrossRef Sim, J., Bartlam, B., & Bernard, M. (2011). The CASP-19 as a measure of quality of life in old age: evaluation of its use in a retirement community. Quality of Life Research, 20(7), 997–1004.PubMedCrossRef
7.
go back to reference Marmot, M., Banks, J., Blundell, R., Lessof, C., & Nazroo, J. (2003). Health, wealth and lifestyles of the older population in England: The 2002 English Longitudinal Study of Ageing. London: The Institute for Fiscal Studies. Marmot, M., Banks, J., Blundell, R., Lessof, C., & Nazroo, J. (2003). Health, wealth and lifestyles of the older population in England: The 2002 English Longitudinal Study of Ageing. London: The Institute for Fiscal Studies.
8.
go back to reference Linacre, J. M. (2005). A user’s guide to Winsteps/Ministeps Rasch-Model Programs. Chicago: MESA Press. Linacre, J. M. (2005). A user’s guide to Winsteps/Ministeps Rasch-Model Programs. Chicago: MESA Press.
9.
go back to reference Masters, G. M. (1982). A Rasch model for partial credit scoring. Psychometrika, 47, 149–174.CrossRef Masters, G. M. (1982). A Rasch model for partial credit scoring. Psychometrika, 47, 149–174.CrossRef
10.
go back to reference Smith, A. B., Rush, R., Fallowfield, L. J., Velikova, G., & Sharpe, M. (2008). Rasch fit statistics and sample size considerations for polytomous data. BMC Medical Research Methodology, 8, 33.PubMedCrossRef Smith, A. B., Rush, R., Fallowfield, L. J., Velikova, G., & Sharpe, M. (2008). Rasch fit statistics and sample size considerations for polytomous data. BMC Medical Research Methodology, 8, 33.PubMedCrossRef
Metagegevens
Titel
Evidence for a unidimensional 15-item version of the CASP-19 using a Rasch model approach
Auteurs
Yemi Oluboyede
Adam B. Smith
Publicatiedatum
01-11-2013
Uitgeverij
Springer Netherlands
Gepubliceerd in
Quality of Life Research / Uitgave 9/2013
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-013-0367-z

Andere artikelen Uitgave 9/2013

Quality of Life Research 9/2013 Naar de uitgave