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1 Department of Sports Science and Clinical Biomechanics, Det Sundhedsvidenskabelige Fakultet, SDU 2 Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, Det Sundhedsvidenskabelige Fakultet, SDU 3 unknown 4 Orthopaedics, Department of Clinical Research, Det Sundhedsvidenskabelige Fakultet, SDU 5 Orthopaedics, Department of Clinical Research, Det Sundhedsvidenskabelige Fakultet, SDU
Objective. Foot and ankle problems are common in adults, and large observational studies are needed to advance our understanding of the etiology and impact of these conditions. Valid and reliable measures of foot and ankle symptoms and physical function are necessary for this research. This study examined psychometric properties of the Foot and Ankle Outcome Score (FAOS) subscales (pain, other symptoms, activities of daily living [ADL], sport and recreational function [Sport/Recreation], and foot and ankle related quality of life [QOL]) in a large, community-based sample of African American and Caucasian men and women 50+ years old. Methods. Johnston County Osteoarthritis Project participants (N=1670) completed the 42-item FAOS (mean age 69 years, 68% women, 31% African American, mean body mass index [BMI] 31.5 kg/m(2) ). Internal consistency, test-retest reliability, convergent validity, and structural validity of each subscale were examined for the sample and for subgroups according to race, gender, age, BMI, presence of knee or hip osteoarthritis, and presence of knee, hip or low back symptoms. Results. For the sample and each subgroup, Cronbach's alphas were 0.95-0.97 (pain), 0.97-0.98 (ADL), 0.94-0.96 (Sport/Recreation), 0.89-0.92(QOL), and 0.72-0.82 (symptoms). Correlation coefficients were 0.24 -0.52 for pain and symptoms subscales with foot and ankle symptoms and 0.30-0.55 for ADL and Sport/Recreation subscales with Western Ontario and McMaster Universities Osteoarthritis Index function subscale. Intraclass correlation coefficients for test-retest reliability were 0.63-0.81. Items loaded on a single factor for each subscale except symptoms (2 factors). Conclusions. The FAOS exhibited sufficient reliability and validity in this large cohort study. © 2013 American College of Rheumatology.
Arthritis Care and Research, 2014, Vol 66, Issue 3
Main Research Area: