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Open Access Research

Cross-cultural adaptation, reliability and validity of the Spanish version of the upper limb functional index

Antonio I Cuesta-Vargas12* and Philip C Gabel3

Author Affiliations

1 Department of Physiotherapy, Faculty of Health Science, University of Malaga, Malaga, Spain

2 School of Clinical Science, Faculty of Health, Queensland University of Technology, Kelvin Grove, Australia

3 Centre for Healthy Activities, Sport and Exercise, Faculty of Science, University of the Sunshine Coast Queensland, Sippy Downs, Australia

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Health and Quality of Life Outcomes 2013, 11:126  doi:10.1186/1477-7525-11-126

Published: 26 July 2013

Abstract

Background

The Upper Limb Functional Index (ULFI) is an internationally widely used outcome measure with robust, valid psychometric properties. The purpose of study is to develop and validate a ULFI Spanish-version (ULFI-Sp).

Methods

A two stage observational study was conducted. The ULFI was cross-culturally adapted to Spanish through double forward and backward translations, the psychometric properties were then validated. Participants (n = 126) with various upper limb conditions of >12 weeks duration completed the ULFI-Sp, QuickDASH and the Euroqol Health Questionnaire 5 Dimensions (EQ-5D-3 L). The full sample determined internal consistency, concurrent criterion validity, construct validity and factor structure; a subgroup (n = 35) determined reliability at seven days.

Results

The ULFI-Sp demonstrated high internal consistency (α = 0.94) and reliability (r = 0.93). Factor structure was one-dimensional and supported construct validity. Criterion validity with the EQ-5D-3 L was fair and inversely correlated (r = −0.59). The QuickDASH data was unavailable for analysis due to excessive missing responses.

Conclusions

The ULFI-Sp is a valid upper limb outcome measure with similar psychometric properties to the English language version.

Keywords:
Upper limb; Psychometrics; Outcome measure; Spanish