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GEROLD STUCKI, ANNELIES BOONEN, PETER TUGWELL, ALARCOS CIEZA, and MAARTEN BOERS ABSTRACT. "What to measure" refers to domains stable over time. "How to measure" is constantly evolving. Lacking a common terminology and common underlying conceptual model of functioning and disability, what and how to measure have been described differently in the various OMERACT Core Sets. With the approval of the International Classification of Functioning, Disability and Health (ICF) by the World Health Assembly in 2001, we now have a universally conceptual model that integrates the biomedical and societal model of functioning and disability. The so-called ICF Core Sets can be used as a basis for the further specification of OMERACT domains addressing aspects of functioning. In line with the successful approach taken by OMERACT, it is suggested to comprehensively specify the domain "function" when defining "what should be measured," and only then to recommend how to measure or which health status measure to use. We recommend comparing the specifications of domains addressing aspects of functioning of OMERACT Core Sets already established with the ICF Core Sets, and examine whether the ICF Core Sets may be useful for the further specification of these domains. (J Rheumatol 2007;34:600-6) Key Indexing Terms:
OMERACT From the Department of Physical Medicine and Rehabilitation, University Hospital Munich, Ludwig-Maximilian University Munich, Germany; ICF Research Branch of the WHO Collaborating Center for the Family of International Classifications, German Institute of Medical Documentation and Information (DIMDI), IHRS, Ludwig-Maximilian University, Munich, Germany; Department of Internal Medicine, Division of Rheumatology, University Hospital Maastricht, Maastricht, The Netherlands; Centre for Global Health, Institute of Population Health, Department of Epidemiology and Community Medicine, University of Ottawa, Ottawa, Ontario, Canada; and Department of Clinical Epidemiology, VU University Medical Center, Amsterdam, The Netherlands. G. Stucki, MD, Professor, Department of Physical Medicine and Rehabilitation, University Hospital Munich, Ludwig-Maximilian University Munich; ICF Research Branch of the WHO Collaborating Center for the Family of International Classifications, German Institute of Medical Documentation and Information (DIMDI), IHRS, Ludwig-Maximilian University; Swiss Paraplegic Research, Nottwil, Switzerland; A. Boonen, MD, Department of Internal Medicine, Division of Rheumatology, University Hospital Maastricht; A. Cieza, PhD, MPH, ICF Research Branch, WHO Collaborating Center for the Family of International Classifications, German Institute of Medical Documentation and Information (DIMDI), IHRS, Ludwig-Maximilian University; Swiss Paraplegic Research, Nottwil, Switzerland; P. Tugwell, MD, MSc, FRCPC, FRCP(UK), Professor, Centre for Global Health, Institute of Population Health, Department of Epidemiology and Community Medicine, University of Ottawa; M. Boers, MSc, MD, PhD, Professor, Department of Clinical Epidemiology, VU University Medical Center. Address reprint requests to Prof. G. Stucki, Department of Physical Medicine and Rehabilitation, University Hospital Munich, Ludwig- Maximilian University Munich, Marchioninistr. 15, 81377 Munich, Germany. E-mail: Gerold.stucki@med.uni-muenchen.de
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