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Gepubliceerd in: Quality of Life Research 5/2007

01-06-2007 | Original Paper

Measuring social difficulties in routine patient-centred assessment: a Rasch analysis of the social difficulties inventory

Auteurs: Adam B. Smith, Penny Wright, Peter Selby, Galina Velikova

Gepubliceerd in: Quality of Life Research | Uitgave 5/2007

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Abstract

Background Social difficulties may add to the psychological burden experienced by cancer patients. Therefore identifying social difficulties in routine oncology practice may help prevent or alleviate distress. The Social Difficulties Inventory (SDI) is a short questionnaire developed for assessing social difficulties in cancer patients. Although well-validated, not enough is known about the clinical meaning and utility of the instrument or whether the items can be meaningfully summed to form a summary index of “Social Distress”. Purpose To determine, using Rasch analysis, whether the SDI could be used as a summary index of social distress specifically examining three fundamental criteria: item fit, unidimensionality and item invariance. Methods The Partial Credit Model was applied to a heterogeneous sample of cancer patients (n = 609) who had completed the SDI. Results Five items were identified as misfitting (infit mean square ≥ 1.3 and standardised t-statistic ≥ 2) and excluded from the subsequent analysis. The remaining items formed a unidimensional interval scale with no additional factors identified in a principal components analysis of the residuals. No differential item functioning was observed for age, gender, diagnosis, extent of disease or social deprivation. The 16-item SDI can be summed to produce an overall index of social distress, facilitating routine identification of social difficulties. Subsequent work is needed to evaluate whether the instrument is able to identify patients with high levels of social distress requiring intervention.
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Literatuur
1.
go back to reference MORI (1992). The social impact of cancer: Research study conducted for CANCER relief Macmillan Fund. London: Cancer Relief Macmillan Fund. MORI (1992). The social impact of cancer: Research study conducted for CANCER relief Macmillan Fund. London: Cancer Relief Macmillan Fund.
2.
go back to reference Wright, E. P., Kiely, M. A., Lynch, P., Cull, A., & Selby, P. J. (2002). Social problems in oncology. British Journal of Cancer, 87, 1099–1104.PubMedCrossRef Wright, E. P., Kiely, M. A., Lynch, P., Cull, A., & Selby, P. J. (2002). Social problems in oncology. British Journal of Cancer, 87, 1099–1104.PubMedCrossRef
3.
go back to reference Wright, P., Smith, A., Booth, L., Winterbottom, A., Kiely, M., Velikova, G., & Selby, P. (2005). Psychosocial difficulties, deprivation and cancer: three questionnaire studies involving 609 cancer patients. British Journal of Cancer, 93, 622–626.PubMedCrossRef Wright, P., Smith, A., Booth, L., Winterbottom, A., Kiely, M., Velikova, G., & Selby, P. (2005). Psychosocial difficulties, deprivation and cancer: three questionnaire studies involving 609 cancer patients. British Journal of Cancer, 93, 622–626.PubMedCrossRef
4.
go back to reference Engel, G. L. (1977). The need for a medical model: A challenge for biomedicine. Science, 196, 129–136.PubMedCrossRef Engel, G. L. (1977). The need for a medical model: A challenge for biomedicine. Science, 196, 129–136.PubMedCrossRef
5.
go back to reference World Health Organization (2001). International classification of functioning, disability and health (ICF). Geneva: WHO. World Health Organization (2001). International classification of functioning, disability and health (ICF). Geneva: WHO.
6.
go back to reference National Institute for Clinical Excellence (2004). Guidance on cancer services improving supportive and palliative care for adults with cancer. London: National Health Service. National Institute for Clinical Excellence (2004). Guidance on cancer services improving supportive and palliative care for adults with cancer. London: National Health Service.
7.
go back to reference Newell, S., Girgis, A., Sanson-Fisher, R. W., & Stewart, J. (1997). Are touchscreen computer surveys acceptable to medical oncology patients? Journal of Psychosocial Oncology, 15, 37–46.CrossRef Newell, S., Girgis, A., Sanson-Fisher, R. W., & Stewart, J. (1997). Are touchscreen computer surveys acceptable to medical oncology patients? Journal of Psychosocial Oncology, 15, 37–46.CrossRef
8.
go back to reference Velikova, G., Wright, E. P., Smith, A. B., Cull, A., Gould, A., Forman, D., Perren, T., Stead, M., Brown, J., & Selby, P. (1999). Automated collection of quality-of-life data: a comparison of paper and computer touch-screen questionnaires. Journal of Clinical Oncology, 17, 998–1007.PubMed Velikova, G., Wright, E. P., Smith, A. B., Cull, A., Gould, A., Forman, D., Perren, T., Stead, M., Brown, J., & Selby, P. (1999). Automated collection of quality-of-life data: a comparison of paper and computer touch-screen questionnaires. Journal of Clinical Oncology, 17, 998–1007.PubMed
9.
go back to reference Wright, E. P., Selby, P. J., Crawford, M., Gillibrand, A., Johnston, C., Perren, T. J., Rush, R., Smith, A., Velikova, G., Watson, K., Gould, A., & Cull, A. (2003). Feasibility and compliance of automated measurement of quality of life in oncology practice. Journal of Clinical Oncology, 21, 374–382.PubMedCrossRef Wright, E. P., Selby, P. J., Crawford, M., Gillibrand, A., Johnston, C., Perren, T. J., Rush, R., Smith, A., Velikova, G., Watson, K., Gould, A., & Cull, A. (2003). Feasibility and compliance of automated measurement of quality of life in oncology practice. Journal of Clinical Oncology, 21, 374–382.PubMedCrossRef
10.
go back to reference Wright, E. P., Kiely, M., Johnston, C., Smith, A. B., Cull, A., & Selby, P. J. (2005b). Development and evaluation of an instrument to assess social difficulties in routine oncology practice. Quality of Life Research, 14, 373–386.CrossRef Wright, E. P., Kiely, M., Johnston, C., Smith, A. B., Cull, A., & Selby, P. J. (2005b). Development and evaluation of an instrument to assess social difficulties in routine oncology practice. Quality of Life Research, 14, 373–386.CrossRef
11.
go back to reference Rasch, G. (1980). Probabilistic models for some intelligence and attainment test. Chicago: University of Chicago Press. Rasch, G. (1980). Probabilistic models for some intelligence and attainment test. Chicago: University of Chicago Press.
12.
go back to reference Bjorner, J. B., Petersen, M. A., Groenvold, M., Aaronson, N., Ahlner-Elmqvist, M., Arraras, J. I., Bredart, A., Fayers, P., Jordhoy, M., Sprangers, M., Watson, M., & Young, T. (2004). Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale. Quality of Life Research, 13, 1683–1697.PubMedCrossRef Bjorner, J. B., Petersen, M. A., Groenvold, M., Aaronson, N., Ahlner-Elmqvist, M., Arraras, J. I., Bredart, A., Fayers, P., Jordhoy, M., Sprangers, M., Watson, M., & Young, T. (2004). Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale. Quality of Life Research, 13, 1683–1697.PubMedCrossRef
13.
go back to reference Lai, J.-S., Cella, D., Chang, C.-H., Bode, R. K., & Heinemann, A. W. (2003). Item banking to improve, shorten and computerize self-reported fatigue: An illustration of steps to create a core item bank from the FACIT-Fatigue Scale. Quality of Life Research, 12, 485–501.PubMedCrossRef Lai, J.-S., Cella, D., Chang, C.-H., Bode, R. K., & Heinemann, A. W. (2003). Item banking to improve, shorten and computerize self-reported fatigue: An illustration of steps to create a core item bank from the FACIT-Fatigue Scale. Quality of Life Research, 12, 485–501.PubMedCrossRef
14.
go back to reference Smith, A. B., Wright, E. P., Rush, R., Stark, D., Velikova, G., & Selby, P. J. (2006). Rasch analysis of the dimensional structure of the hospital anxiety and depression scale. Psycho-Oncology, 15, 817–827.PubMedCrossRef Smith, A. B., Wright, E. P., Rush, R., Stark, D., Velikova, G., & Selby, P. J. (2006). Rasch analysis of the dimensional structure of the hospital anxiety and depression scale. Psycho-Oncology, 15, 817–827.PubMedCrossRef
15.
go back to reference Carstairs, V., & Morris, R. (1991). Deprivation in Scotland. Aberdeen: Aberdeen University Press. Carstairs, V., & Morris, R. (1991). Deprivation in Scotland. Aberdeen: Aberdeen University Press.
16.
go back to reference Census Dissemination Unit. (2004). Pre-calculated deprivation scores. http://www.census.ac.uk/cdu/. Census Dissemination Unit. (2004). Pre-calculated deprivation scores. http://​www.​census.​ac.​uk/​cdu/​.​
17.
go back to reference Wright, B. D., Linacre, J. M., Gustafson, J.-E., & Martin-Loef, P. (1994). Reasonable mean-square fit values. Rasch Measurement Transactions, 8, 370. Wright, B. D., Linacre, J. M., Gustafson, J.-E., & Martin-Loef, P. (1994). Reasonable mean-square fit values. Rasch Measurement Transactions, 8, 370.
18.
go back to reference Smith, R. M., Schumacker, R. E., & Bush, M. J. (1998). Using item mean squares to evaluate fit to the Rasch model. Journal of Outcome Measure, 2, 66–78. Smith, R. M., Schumacker, R. E., & Bush, M. J. (1998). Using item mean squares to evaluate fit to the Rasch model. Journal of Outcome Measure, 2, 66–78.
19.
go back to reference Bond, T. G., & Fox, C. M. (2001). Applying the Rasch model: Fundamental measurement in the human sciences. London: Lawrence Erlbaum Associates. Bond, T. G., & Fox, C. M. (2001). Applying the Rasch model: Fundamental measurement in the human sciences. London: Lawrence Erlbaum Associates.
20.
go back to reference Stucki, G., Daltroy, L., Katz, J. N, Johannesson, M., & Liang, M. H. (1996). Interpretation of change scores in ordinal clinical scales and health status measures: The whole may not equal the sum of the parts. Journal of Clinical Epidemiology, 49, 711–717.PubMedCrossRef Stucki, G., Daltroy, L., Katz, J. N, Johannesson, M., & Liang, M. H. (1996). Interpretation of change scores in ordinal clinical scales and health status measures: The whole may not equal the sum of the parts. Journal of Clinical Epidemiology, 49, 711–717.PubMedCrossRef
21.
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.
22.
go back to reference Smith, R. M., & Suh, K. K. (2003). Rasch fit statistics as a test of the invariance of item parameter estimates. Journal of Applied Measurement, 4, 153–163.PubMed Smith, R. M., & Suh, K. K. (2003). Rasch fit statistics as a test of the invariance of item parameter estimates. Journal of Applied Measurement, 4, 153–163.PubMed
23.
go back to reference Smith, E. V. (2002). Detecting and evaluating the impact of multidimensionality using item fit statistics and principal component analysis of residuals. Journal of Applied Measurement, 3, 205–231.PubMed Smith, E. V. (2002). Detecting and evaluating the impact of multidimensionality using item fit statistics and principal component analysis of residuals. Journal of Applied Measurement, 3, 205–231.PubMed
24.
go back to reference Petersen, M. A., Groenvold, M., Bjorner, J. B., Aaronson, N., Conroy, T., Cull, A., Fayers, P., Hjermstad, M., Sprangers, M., & Sullivan, M. (2003). Use of differential item functioning analysis to assess the equivalence of translations of a questionnaire. Quality of Life Research, 12, 373–385.PubMedCrossRef Petersen, M. A., Groenvold, M., Bjorner, J. B., Aaronson, N., Conroy, T., Cull, A., Fayers, P., Hjermstad, M., Sprangers, M., & Sullivan, M. (2003). Use of differential item functioning analysis to assess the equivalence of translations of a questionnaire. Quality of Life Research, 12, 373–385.PubMedCrossRef
25.
go back to reference Masters, G. N. (1982). A Rasch model for partial credit scoring. Psychometrika, 47, 149–174.CrossRef Masters, G. N. (1982). A Rasch model for partial credit scoring. Psychometrika, 47, 149–174.CrossRef
Metagegevens
Titel
Measuring social difficulties in routine patient-centred assessment: a Rasch analysis of the social difficulties inventory
Auteurs
Adam B. Smith
Penny Wright
Peter Selby
Galina Velikova
Publicatiedatum
01-06-2007
Uitgeverij
Kluwer Academic Publishers
Gepubliceerd in
Quality of Life Research / Uitgave 5/2007
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-007-9181-9

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