Abstract
Background
To evaluate function and disability, the WHO has developed the WHO Disability Assessment Schedule II (WHODASII), an instrument arising from the same conceptual basis as the International Classification of Functioning, Disability, and Health (ICF).
Objectives
The general objective of this study was to investigate whether the WHODASII––German version—is a valid instrument to measure functioning and disability across various conditions. Specific aims were (1) to assess its psychometric properties (reliability, validity, and sensitivity to change) based on the traditional test theory and (2) to compare its sensitivity to change after a rehabilitative intervention to the Short Form 36 (SF-36).
Research design
This was a multi-center study with convenience samples of patients with different chronic conditions undergoing rehabilitation. Patients completed the WHODASII and the SF-36 before and after a rehabilitation treatment. Health professionals rated in cooperation with the patients the pain of the patients based on the ICF category “sensation of pain.”
Results
904 patients were included in the study. The Cronbach’s range from 0.70 to 0.97 for the different subscales of WHODASII. With exception of the subscale Activities, the exploratory-factor structure of the WHODASII corresponds highly with the original structure. The effect size (ES) of the WHODASII total score ranged from 0.16 to 0.69 depending on the subgroup. The ES of the SF-36 summary scores ranged from 0.03 to 1.40.
Conclusions
The WHODAS II (German version) is a useful instrument for measuring functioning and disability in patients with musculoskeletal diseases, internal diseases, stroke, breast cancer, and depressive disorder. The results of this study support the reliability, validity, dimensionality, and responsiveness of the German version of the WHODASII. However, the reproducibility in test–retest samples of stable patients, as well as the question to what extent a summary score can be constructed, requires further investigation.
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References
Ewert, T., Fuessl, M., Cieza, A., Andersen, C., Chatterji, S., Kostanjsek, N., & Stucki, G. (2004). Identification of the most common patient problems in patients with chronic conditions using the ICF checklist. Journal of Rehabilitation Medicine, 36(Suppl. 44), 22–29.
WHO Mental Bulletin (2004). A newsletter on noncommunicable diseases and mental health (p. 6). Geneva: WHO Mental Health Bulletin.
World Health Organization. (2001). International classification of functioning, disability and health (ICF). Geneva: World Health Organization.
Chávez, L. M., Canino, G., Negrón, G., Shrout, P. E., Matias-Carrelo, L. E., Aguilar-Gaxiola, S., et al. (2005). Psychometric properties of the Spanish version of two mental health outcome measures: World Health Organization Disability Assessment Schedule II and Lehman’s quality of life interview. Mental Health Services Research, 7(3), 145–159.
Vázquez-Barquero, J. L., Vázquez Bourgón, E., Herrera Castanedo, S., Saiz, J., Uriarte, M., Morales, F., et al. (2000). Versión en lengua española de un nuevo cuestionario de evaluación de discapacidades de la OMS (WHO-DAS-II): Fase inicial de desarrollo y estudio piloto. Grupo Cantabria en Discapacidades. Spanish version of the new World Health Organization Disability Assessment Schedule II (WHO-DAS-II): Initial phase of development and pilot study. Cantabria disability work group. Actas Espanolas de Psiquiatri, 28(2), 77–87.
Chopra, P. K., Couper, J. W., & Herrman, H. (2004). The assessment of patients with long-term psychotic disorders: Application of the WHO disability assessment schedule II. The Australian and New Zealand Journal of Psychiatry, 38(9), 753–759.
McKibbin, C., Patterson, T. L., & Jeste, D. V. (2004). Assessing disability in older patients with schizophrenia: Results from the WHODAS-II. The Journal of Nervous and Mental Disease, 192(6), 405–413.
Chwastiak, L. A., & Von Korff, M. (2005). Disability in depression and back pain: Evaluation of the World Health Organization Disability Assessment Schedule (WHODAS II) in a primary care setting. Journal of Clinical Epidemiology, 56(6), 507–514.
van Tubergen, A., Landewe, R., Heuft-Dorenbosch, L., Spoorenberg, A., van der Heijde, D., van der Tempel, H., et al. (2003). Assessment of disability with the World Health Organization Disability Assessment Schedule II in patients with ankylosing spondylitis. Annals of the Rheumatic Diseases, 62(2), 140–145.
Ware, J. E., & Sherbourne, C. D. (1992). The MOS 36-item short-form health survey (SF-36). A conceptual framework and item selection. Medical Care, 30, 473–483.
World Health Organization Disability Assessment Schedule II. Retrieved from http://www.who.int/icidh/whodas/. Accessed 11 September 2006.
Tarlov, A. R., Ware, J. E., Greenfield, S., Nelson, E. C., Perrin, E., & Zubkoff, M. (1989). The medical outcomes study: An application of methods for monitoring the results of medical care. JAMA, 262, 925–930.
van Baalen, B., Odding, E., van Woensel, M. P., & Roebroeck, M. E. (2006). Reliability and sensitivity to change of measurement instruments used in a traumatic brain injury population. Clinical Rehabilitation, 20(8), 686–700.
Buhrlen, B., Gerdes, N., & Jäckel, W. H. (2005). Development and psychometric testing of a patient questionnaire for medical rehabilitation (IRES-3). Rehabilitation, 44(2), 63–74.
Bullinger, M., & Kirchberger, I. (1998). SF-36 Fragebogen zum Gesundheitszustand. Handanweisung. Göttingen: Hogrefe.
McHorney, C. A. (1996). Measuring and monitoring general health status in elderly persons: Practical and methodological issues in using the SF-36 Health Survey. Gerontologist, 36(5), 571–583.
Cronbach, L. (1951). Coefficient alpha and the internal structure of tests. Psychometrika, 16, 297.
Kaiser, H. F. (1974). An index of factorial simplicity. Psychometrika, 39, 31–36.
Cable, D. M., & DeRue, D. S. (2002). The convergent and discriminant validity of subjective fit perceptions. The Journal of Applied Psychology, 87, 875–884.
Lachenbruch, P. A. (1975). Discriminant analysis. New York: Hafner.
Krauth, J. (1983). Bewertung der Änderungssensitivität von Items. Zeitschrift fur Differential Diagnostic Psychologie, 4, 7–28.
Schochat, T., Rehberg, W., von Kempis, J., Stucki, G., & Jäckel, W. H. (2000). The North American Spine Society Lumbar Spine Outcome Assessment Instrument: Translation and psychometric analysis of the German version in rehabilitation patients with chronic back pain. Zeitschrift fur Rheumatologie, 59, 303–313, German.
Kazis, L. E., Anderson, J. J., & Meenan, R. F. (1989). Effect sizes for interpreting changes in health status. Medical Care, 27, 178–189.
Norman, G. R., Startford, P., & Regher, G. (1997). Methodological problems in the retrospective computation of responsiveness to change: The lesson of Cronbach. Journal of Clinical Epidemiology, 50, 869–879.
Cohen, J. (1977). Statistical power analysis for the behavioural sciences. New York: Academic.
Liang, M. H., Lew, R. A., Stucki, G., Fortin, P. R., & Daltroy, L. (2002). Measuring clinically important changes with patient-oriented questionnaires. Medical Care, 40(4), II-45–II51.
Liang, M. H., Fossel, A. H., & Larson, M. G. (1990). Comparisons of five health status instruments for orthopedic evaluation. Medical Care, 28, 632–642.
Fayers, P. M., & Machin, D. (2000). Quality of life: Assessment, analysis and interpretation. Chichester, UK: Wiley.
Hair, F., Anderson, R., & Tatham, R. (1998). Multivariate data analysis with readings (5th ed.). Englewood Cliffs, NJ: Prentice Hall.
Nunally, J. C. (1978). Psychometric theory. New York: McGraw-Hill.
Kaiser, H. F. (1974). An index of factorial simplicity. Psychometrika, 39, 31–36.
Hutcheson, G., & Sofroniou, N. (1999). The multivariate social scientist. (pp. 224–225). London: Sage.
Bryant, F., & Yarnold, P. R. (1995). Reading and understanding multivariate statistics. In L. Grimm, & R. R. Yarnold (Eds.), Reading and understanding multivariate statistics. (pp. 99–136). Washington, DC: American Psychological Association.
Gorsuch, R. L. (1983). Factor analysis. Hillsdale, NJ: Erlbaum.
Alwin, D. F. (1989). Problems in the estimation and interpretation of the reliability of survey data. Quality and Quantity, 23, 277–331.
Cieza, A., & Stucki, G. (2005). Content comparison of health related quality of life instruments based on the ICF. Quality of Life Resarch, 14(5), 1225–1237.
Ware, J., & Gandek, B. (1998). Overview of the SF-36 Health Survey and International Quality of Life Assessment (IQOLA). Project. Journal of Clinical Epidemiology, 51(11), 903–912.
Hyland, M. E. (2003). A brief guide to the selection of quality of life instrument. Health and Quality of Life Outcomes, 1(1), 24.
Zwingmann, C., Metzger, D., & Jäckel, W. H. (1998). Short Form-36 Health Survey (SF-36): Psychometrische Analysen der deutschen Version bei Rehabilitanden mit chronischen Rückenschmerzen. Diagnostica, 44(4), 209–219.
Rasch, G. (1980). Probabilistic models for some intelligence and attainment tests. Expanded edition. Chicago: University of Chicago Press.
McHorney, C. A., & Monahan, P. O. (2004). Postscript: Applications of Rasch analysis in health care. Medical Care, 42(Suppl. 1), I73–I78.
Cieza, A., & Stucki, G. (2005). Content comparison of health-related quality of life (HRQOL) instruments based on the international classification of functioning, disability and health (ICF). Quality of Life Resarch, 14(5), 1225–1237.
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Pösl, M., Cieza, A. & Stucki, G. Psychometric properties of the WHODASII in rehabilitation patients. Qual Life Res 16, 1521–1531 (2007). https://doi.org/10.1007/s11136-007-9259-4
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DOI: https://doi.org/10.1007/s11136-007-9259-4