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Validation of the Comprehensive ICF Core Set for Osteoarthritis (OA) in Patients with Knee OA:
A Singaporean Perspective
FENG XIE, NGAI-NUNG LO, HIN-PENG LEE, ALARCOS CIEZA, and SHU-CHUEN LI
ABSTRACT. Methods. Patients with knee OA completed case report forms, which included the SF-36, Self-administered Comorbidity Questionnaire (SCQ), and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). Health professionals completed the ICF Comprehensive Core Set for OA. Content validity was evaluated using frequency and percentage of patients with a reported problem for each ICF category, while construct validity was evaluated using Spearman correlation between the ICF categories and SF-36 and the WOMAC. Results. A consecutive sample of 122 patients completed this study. In body functions, 12 categories were documented as a problem by more than 10% of the patients, of which 7, 12, and 10 categories correlated significantly with the SF-36 Physical Component Summary (PCS), WOMAC pain, and physical function, respectively. Only s750 (Structure of lower extremity) in body structures was reported as a problem and correlated significantly with SF-36 and WOMAC. In activities and participation, 12 categories were reported as a problem by more than 10% of the patients, of which, 11, 11, and 12 correlated significantly with SF-36 PCS, WOMAC pain, and physical function, respectively. In environmental factors, 2 and 14 categories were documented as barrier and facilitator, respectively, by more than 10% of the patients, but none correlated significantly with SF-36 and WOMAC. Conclusion. The content and construct validity of the Comprehensive Core Set for OA could be supported. Some categories, especially in environmental factors, need to be studied further in different sociocultural contexts. (First Release Oct 15 2007; J Rheumatol 2007;34:2301-7) Key Indexing Terms:
ICF COMPREHENSIVE CORE SET
From the Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada, and Centre for Health Services Research, Yong Loo Lin School of Medicine, National University of Singapore; Department of Orthopaedic Surgery, Singapore General Hospital; Department of Community, Occupational, and Family Medicine, Yong Loo Lin School of Medicine, National University of Singapore; Institute for Health and Rehabilitation Sciences, ICF Research Branch of WHO CC FIC (DIMDI), Ludwig-Maximilian University, Munich, Germany; Swiss Paraplegic Research, Human Functioning Science Division, Nottwil, Switzerland; and Department of Experimental Pharmacology and Pharmacy, University of Newcastle, Newcastle, Australia. Supported by an Academic Research Grant from the National University of Singapore, No. R-148-000-059-112. F. Xie, PhD, Assistant Professor, Department of Clinical Epidemiology and Biostatistics, McMaster University and Research Fellow, Centre for Health Services Research, Yong Loo Lin School of Medicine, National University of Singapore; N-N. Lo, FRCS (Edin), Senior Consultant, Department of Orthopaedic Surgery, Singapore General Hospital; H-P. Lee, PhD, Professor, Department of Community, Occupational, and Family Medicine, Yong Loo Lin School of Medicine, National University of Singapore; A. Cieza, PhD, MPH, Institute for Health and Rehabilitation Sciences, ICF Research Branch of WHO CC FIC (DIMDI), Ludwig-Maximilian University, and Swiss Paraplegic Research, Human Functioning Science Division; S-C. Li, PhD, MBA, Professor, Discipline of Pharmacy and Experimental Pharmacology, University of Newcastle. Address reprint requests to Dr. F. Xie, Department of Clinical Epidemiology and Biostatistics, McMaster University, Suite 2000, 25 Main St. West, Hamilton, Ontario L8P 1H1, Canada. E-mail: fengxie@mcmaster.ca Accepted for publication July 30, 2007. |
