Journal of the Japanese Physical Therapy Association
Online ISSN : 2188-8361
Print ISSN : 1344-1272
ISSN-L : 1344-1272
Physical Therapy Japan Vol. 41 (2014) Abstracts
Reliability, Validity, and Responsiveness of the Japanese Version of the Lower Extremity Functional Scale in Outpatients with Lower Extremity Musculoskeletal Dysfunction
Koji NAKAMARUOsamu NITTAJunya AIZAWATakayuki KOYAMA
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2015 Volume 18 Issue 1 Pages 50

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Abstract

Purpose: The purpose of this study was to assess the reliability, validity, and responsiveness of the Japanese version of the Lower Extremity Functional Scale (LEFS-J).
Methods: A total of 112 outpatients with lower-extremity musculoskeletal dysfunction participated in the study. Psychometric testing include reliability by internal consistency (Cronbach α) and test-retest reliability (intraclass correlation coefficient), convergent validity by comparing the LEFS-J with the short-form health survey, version 36 (Pearson correlation) and responsiveness (unpaired t tests and minimal detectable change).
Results: The Cronbach α of the LEFS-J was 0.96 and intraclass correlation coefficient for test-retest reliability was 0.92. The correlation between the LEFS and the short-form health survey physical function subscale was excellent (r = 0.75). The analysis of responsiveness was calculated with an unpaired t test after 4 weeks of treatment demonstrating a statistically significant difference between the stable and improved patients (p = 0.02). The minimal detectable change was calculated 8.14.
Conclusion: The LEFS-J is a valid, reliable, and responsive tool that can be used assess Japanese outpatients with lower-extremity musculoskeletal dysfunction.

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© 2015 by the Japanese Physical Therapy Association
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