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Structural validity and internal consistency of the Qualidem in people with severe dementia

Published online by Cambridge University Press:  04 September 2017

Alexander M. M. Arons
Affiliation:
Arons Consultancy, Nijmegen, the Netherlands
Roland B. Wetzels
Affiliation:
Department of Primary and Community Care, Centre for Family Medicine, Geriatric Care and Public Health, Radboud University Medical Center, Nijmegen, the Netherlands Pleyade, Elderly Care Organization, Arnhem, the Netherlands
Sandra Zwijsen
Affiliation:
Department of General Practice and Elderly Care Medicine, VU University Medical Center, Amsterdam, the Netherlands
Hilde Verbeek
Affiliation:
Department of Health Services Research CAPHRI School for Public Health and Primary Care, Maastricht University, Maastricht, the Netherlands
Geertje van de Ven
Affiliation:
FWG, Research & Development, Utrecht, the Netherlands
Teake P. Ettema
Affiliation:
SHDH, Haarlem, the Netherlands
Raymond T. C. M. Koopmans
Affiliation:
Department of Primary and Community Care, Centre for Family Medicine, Geriatric Care and Public Health, Radboud University Medical Center, Nijmegen, the Netherlands Alzheimer Centre, Radboud University Medical Center, Nijmegen, the Netherlands Joachim en Anna, Center for Specialized Geriatric Care, Nijmegen, the Netherlands
Debby L. Gerritsen
Affiliation:
Department of Primary and Community Care, Centre for Family Medicine, Geriatric Care and Public Health, Radboud University Medical Center, Nijmegen, the Netherlands Alzheimer Centre, Radboud University Medical Center, Nijmegen, the Netherlands
Corresponding

Abstract

Background:

Since its development, the Qualidem has had items that were considered unsuited for people with very severe dementia. This study attempted to investigate the applicability of all Qualidem items in people with all stages of dementia severity.

Methods:

Four data sets that contained Qualidem observations on people with dementia were combined. Dementia severity was categorized based on the Global Deterioration Scale (GDS), with a dichotomization of very severe dementia (GDS 7) and others (GDS 1–6). Unidimensional latent-trait models (Mokken scaling) were estimated to fit the Qualidem responses in the overall sample and the dichotomized groups. Scalability was assessed using coefficients of homogeneity (Loevinger's H), while reliability was assessed with Cronbach's α and ρ.

Results:

Combining the four databases resulted in 4,354 Qualidem measurements. The scalability of all scales was considered acceptable in the overall sample, as well is in the subgroups (all H > 0.3). Additionally, the reliability was good–excellent in the scales: “positive affect,” “positive self-image,” “care relationship,” and “negative affect.” Reliability was questionable–acceptable for “feeling at home,” “social relations,” “social isolation,” and “restless tense behavior.” Reliability was poor for “having something to do.”

Conclusions:

Statistical considerations allow using all Qualidem items in all dementia stages. Future research should determine balance of statistical- versus conceptual-based reasoning in this academic debate.

Type
Research Article
Copyright
Copyright © International Psychogeriatric Association 2017 

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References

Bouman, A., Ettema, T., Wetzels, R., van Beek, A., de Lange, J. and Dröes, R. (2011). Evaluation of Qualidem: a dementia‐specific quality of life instrument for persons with dementia in residential settings; scalability and reliability of subscales in four Dutch field surveys. International Journal of Geriatric Psychiatry, 26, 711722.CrossRefGoogle ScholarPubMed
Brod, M., Stewart, A. L., Sands, L. and Walton, P. (1999). Conceptualization and measurement of quality of life in dementia: the dementia quality of life instrument (DQoL). The Gerontologist, 39, 2536.CrossRefGoogle Scholar
Dichter, M. N. et al. (2013). Scalability and internal consistency of the German version of the dementia-specific quality of life instrument QUALIDEM in nursing homes-a secondary data analysis. Health and Quality of Life Outcomes, 11, 91. doi: 10.1186/1477-7525-11-91.CrossRefGoogle Scholar
Dichter, M., Bartholomeyczik, S., Nordheim, J., Achterberg, W. and Halek, M. (2011). Validity, reliability, and feasibility of a quality of life questionnaire for people with dementia. Zeitschrift Fur Gerontologie Und Geriatrie, 44, 405410.CrossRefGoogle ScholarPubMed
Ettema, T. P., Dröes, R. M., de Lange, J., Mellenbergh, G. J. and Ribbe, M. W. (2007b). QUALIDEM: development and evaluation of a dementia specific quality of life instrument. Scalability, reliability and internal structure. International Journal of Geriatric Psychiatry, 22, 549556.CrossRefGoogle ScholarPubMed
Ettema, T. P., Dröes, R.-M., de Lange, J., Ooms, M. E., Mellenbergh, G. J. and Ribbe, M. W. (2005). The concept of quality of life in dementia in the different stages of the disease. International Psychogeriatrics, 17, 353370.CrossRefGoogle ScholarPubMed
Ettema, T., Dröes, R.-M., de Lange, J., Mellenbergh, G. and Ribbe, M. (2007a). QUALIDEM: development and evaluation of a dementia specific quality of life instrument-validation. International Journal of Geriatric Psychiatry, 22, 424430.CrossRefGoogle ScholarPubMed
Finnema, E., Dröes, R.-M., Ribbe, M. and van Tilburg, W. (2000). A review of psychosocial models in psychogeriatrics: implications for care and research. Alzheimer Disease & Associated Disorders, 14, 6880.CrossRefGoogle ScholarPubMed
Gräske, J., Verbeek, H., Gellert, P., Fischer, T., Kuhlmey, A. and Wolf-Ostermann, K. (2014). How to measure quality of life in shared-housing arrangements? A comparison of dementia-specific instruments. Quality of Life Research, 23, 549559.CrossRefGoogle ScholarPubMed
Koopmans, R. T., van der Molen, M., Raats, M. and Ettema, T. P. (2009). Neuropsychiatric symptoms and quality of life in patients in the final phase of dementia. International Journal of Geriatric Psychiatry, 24, 2532.CrossRefGoogle Scholar
Lawton, M. P. (1994). Quality-of-life in Alzheimer-disease. Alzheimer Disease & Associated Disorders, 8, 138150.CrossRefGoogle ScholarPubMed
Loevinger, J. (1947). A systematic approach to the construction and evaluation of tests of ability. Psychological Monographs: General and Applied, 61, 1–49. DOI: 10.1037/h0093565.CrossRefGoogle Scholar
Logsdon, R. G., Gibbons, L. E., McCurry, S. M. and Teri, L. (1999). Quality of life in Alzheimer's disease: patient and caregiver reports. Journal of Mental Health and Aging, 5, 2132.Google Scholar
Mokken, R. J. (1971). A Theory and Procedure of Scale Analysis. The Hague, Netherlands: Mouton The Hague.CrossRefGoogle Scholar
Moyle, W. and Murfield, J. E. (2013). Health-related quality of life in older people with severe dementia: challenges for measurement and management. Expert Rev Pharmacoecon Outcomes Res, 13, 109122.CrossRefGoogle ScholarPubMed
Oudman, E. and Zwart, E. (2012). Quality of life of patients with Korsakoff's syndrome and patients with dementia: a cross-sectional study. Journal of the American Medical Directors Association, 13, 778781.CrossRefGoogle ScholarPubMed
Reisberg, B., Ferris, S. H., de Leon, M. J. and Crook, T. (1982). The Global Deterioration Scale for assessment of primary degenerative dementia. The American journal of psychiatry, 139, 11361139.Google ScholarPubMed
Schouten, H. J., Knol, W., Egberts, T. C., Schobben, A. F., Jansen, P. A. and van Marum, R. J. (2012). Quality of life of elderly patients with antipsychotic-induced parkinsonism: a cross-sectional study. Journal of the American Medical Directors Association, 13, 82.e1–5.CrossRefGoogle ScholarPubMed
Sijtsma, K. and Molenaar, I. W. (2002). Introduction to Nonparametric Item Response Theory. Thousand Oaks, CA: SAGE Publications, Incorporated.CrossRefGoogle Scholar
Team, R. D. C. (2005). R: a language and environment for statistical computing. ISBN 3-900051-07-0. R Foundation for Statistical Computing. Vienna, Austria, 2013. Available at: http://www.R-project.org.Google Scholar
Teut, M. et al. (2013). Effects and feasibility of an Integrative Medicine program for geriatric patients–a cluster-randomized pilot study. Clinical interventions in aging, 8, 953961.CrossRefGoogle ScholarPubMed
van de Ven, G. et al. (2012). Improving person-centred care in nursing homes through dementia-care mapping: design of a cluster-randomised controlled trial. BMC geriatrics, 12, 19.CrossRefGoogle ScholarPubMed
van de Ven, G. et al. (2013). Effects of dementia-care mapping on residents and staff of care homes: a pragmatic cluster-randomised controlled trial. PloS one, 8, e67325.CrossRefGoogle ScholarPubMed
Van der Ark, L. A. (2007). Mokken scale analysis in R. Journal of Statistical Software, 20, 119.Google Scholar
van Schuur, W. H. (2011). Ordinal Item Response Theory: Mokken Scale Analysis. Thousand Oaks, CA: SAGE Publications, Incorporated.CrossRefGoogle Scholar
Ven-Vakhteeva, J., Bor, H., Wetzels, R. B., Koopmans, R. T. and Zuidema, S. U. (2012). The impact of antipsychotics and neuropsychiatric symptoms on the quality of life of people with dementia living in nursing homes. International Journal of Geriatric Psychiatry, 28, 530538.CrossRefGoogle ScholarPubMed
Verbeek, H., Zwakhalen, S. M., van Rossum, E., Ambergen, T., Kempen, G. I. and Hamers, J. P. (2010). Dementia care redesigned: effects of small-scale living facilities on residents, their family caregivers, and staff. Journal of the American Medical Directors Association, 11, 662670.CrossRefGoogle Scholar
Wetzels, R. B., Zuidema, S. U., de Jonghe, J. F., Verhey, F. R. and Koopmans, R. T. (2010b). Course of neuropsychiatric symptoms in residents with dementia in nursing homes over 2-year period. American Journal of Geriatric Psych, 18, 10541065.CrossRefGoogle ScholarPubMed
Wetzels, R., Zuidema, S., de Jonghe, J., Verhey, F. and Koopmans, R. (2010a). Determinants of quality of life in nursing home residents with dementia. Dementia and Geriatric Cognitive Disorders, 29, 189197.CrossRefGoogle ScholarPubMed
Wolf‐Ostermann, K., Worch, A., Fischer, T., Wulff, I. and Gräske, J. (2012). Health outcomes and quality of life of residents of shared‐housing arrangements compared to residents of special care units–results of the Berlin DeWeGE‐study. Journal of Clinical Nursing, 21, 30473060.CrossRefGoogle ScholarPubMed
Zwijsen, S. et al. (2011). Grip on challenging behaviour: a multidisciplinary care programme for managing behavioural problems in nursing home residents with dementia. Study protocol. BMC Health Services Research, 11, 41. Available at: https://doi.org/10.1186/1472-6963-11-41 CrossRefGoogle ScholarPubMed

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