Cross cultural adaptation and validation of a Spanish version of the lower limb functional index
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RESEARCH
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Cross cultural adaptation and validation of a Spanish version of the lower limb functional index Antonio I Cuesta-Vargas1,2*, Charles P Gabel3 and Paul Bennett2
Abstract Background: The Lower Limb Functional Index (LLFI) is a relatively recently published regional outcome measure. The development article showed the LLFI had robust and valid clinimetric properties with sound psychometric and practical characteristics when compared to the Lower Limb Extremity Scale (LEFS) criterion standard. Objective: The purpose of this study was cross cultural adaptation and validation of the LLFI Spanish-version (LLFI-Sp) in a Spanish population. Methods: A two stage observational study was conducted. The LLFI was initially cross-culturally adapted to Spanish through double forward and single backward translation; then subsequently validated for the psychometric characteristics of validity, internal consistency, reliability, error score and factor structure. Participants (n = 136) with various lower limb conditions of >12 weeks duration completed the LLFI-Sp, Western Ontario and McMaster University Osteoarthritis Index (WOMAC) and the Euroqol Health Questionnaire 5 Dimensions (EQ-5D-3 L). The full sample was employed to determine internal consistency, concurrent criterion validity, construct validity and factor structure; a subgroup (n = 45) determined reliability at seven days concurrently completing a global rating of change scale. Results: The LLFI-Sp demonstrated high but not excessive internal consistency (α = 0.91) and high reliability (ICC = 0.96). The factor structure was one-dimensional which supported the construct validity. Criterion validity with the WOMAC was strong (r = 0.77) and with the EQ-5D-3 L fair and inversely correlated (r = −0.62). The study limitations included the lack of longitudinal data and the determination of responsiveness. Conclusions: The LLFI-Sp supports the findings of the original English version as being a valid lower limb regional outcome measure. It demonstrated similar psychometric properties for internal consistency, validity, reliability, error score and factor structure. Keywords: Lower limb, Psychometrics, Outcome assessment, Spanish
Introduction Patient reported outcome (PRO) measures [1,2] are an integral part and process of the management of a patient’s health. These tools are primarily used to objectively determine any response or change in a patient’s status as a consequence of natural healing or the use of an intervention [3]. In this way there is a rapid * Correspondence: [email protected] 1 Departamento de Psiquiatría y Fisioterapia, Facultad de Ciencias de la Salud, Universidad de Malaga, Andalucia Tech, Instituto de Biomedicina de Malaga (IBIMA), Grupo de Clinimetria (AE-14), Málaga, Spain 2 School of Clinical Science, Faculty of Health at the Queensland University of Technology, Brisbane, Australia Full list of author information is available at the end of the article
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