A1 Refereed original research article in a scientific journal
Structural and Construct Validity of the Foot and Ankle Ability Measure (FAAM) With an Emphasis on Pain and Functionality After Foot Surgery: A Multicenter Study
Authors: Saarinen Antti J, Uimonen Mikko M, Suominen Eetu N, Sandelin Henrik, Repo Jussi P
Publisher: Elsevier
Publication year: 2022
Journal: Journal of Foot and Ankle Surgery
Journal name in source: The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons
Journal acronym: J Foot Ankle Surg
Volume: 61
Issue: 4
First page : 828
Last page: 878
ISSN: 1067-2516
eISSN: 1542-2224
DOI: https://doi.org/10.1053/j.jfas.2021.12.011
Web address : https://www.sciencedirect.com/science/article/pii/S1067251621005019?via%3Dihub
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/69111965
The Foot and Ankle Ability Measure (FAAM) is a patient-reported outcome measure that is available in several languages. We aim to assess the structural and construct validity of the FAAM with an emphasis on pain and functionality after foot surgery. The activities of daily living (ADL) and Sports subscales of the Finnish version of the FAAM were completed by 182 patients who underwent operative treatment for disorders of the foot. Convergent validity was assessed by principal component analysis using Spearman's correlation coefficient between the FAAM subscales and the principal components (Function-PC and Pain-PC) derived from validated patient-reported outcome measures. Subscales were studied for floor and ceiling effects, internal consistency and unidimensionality. Internal consistency was examined with Cronbach's alpha and the subscale structure with exploratory factor analysis. FAAM-ADL had high correlation with the Function-PC (r = 0.87, 95% confidence interval [CI] 0.81-0.91) and the Pain-PC (r = 0.75, 95% CI 0.65-0.83). FAAM-Sports had moderate correlation (r = 0.64, 95% CI 0.50-0.74) with the Function-PC and high correlation (r = 0.74, 95% CI 0.64-0.82) with the Pain-PC. No floor or ceiling effects were observed. Cronbach's alpha was 0.97 (95% CI 0.96-0.98) for the ADL and 0.93 (95% CI 0.91-0.95) for the Sports subscales. The results supported the unidimensionality of the FAAM-Sports. Within the ADL subscale, 3 factors were identified, suggesting a 3-factor model for the FAAM overall. Results highlighted the inter-relationship of pain and physical function. Further research on longitudinal validity is needed.
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