Hou W.-H.Yeh T.-S.HUEY-WEN LIANG2020-03-312020-03-3120140929-6646https://www.scopus.com/inward/record.uri?eid=2-s2.0-84898814634&doi=10.1016%2fj.jfma.2012.07.032&partnerID=40&md5=51f303981ee263a88456854cc841b168https://scholars.lib.ntu.edu.tw/handle/123456789/482355Background/Purpose: The Lower Extremity Functional Scale (LEFS) is a region-specific functional outcome measure designed for patients with lower extremity musculoskeletal dysfunction. In this study, a Taiwan Chinese version was adapted and its validity and reliability were tested. Methods: The LEFS questionnaire was adapted and tested in 159 patients with lower extremity disorders from two university hospitals. The Cronbach α-coefficient value was calculated for internal consistency. Intraclass correlation coefficient (ICC), Bland-Altman plot, and minimal detectable change (MDC) were used for evaluating the test-retest reliability and agreement in 40 patients followed up within 7 days. Construct and convergent/divergent validity were examined by principal component analysis and correlation was examined with the Medical Outcomes Study Short Form-36 (SF-36) questionnaire. Results: The internal consistency and test-retest reliability of the adapted LEFS questionnaire were satisfactory [Cronbach α: 0.98; ICC(2,1), 0.97]. The Bland-Altman plot of the two tests showed a relatively consistent distribution, with limits of agreement in the range of -9.32 to 13.02. The MDC at 90% confidence interval was 9.6. One-factor model was confirmed by principal component analysis. Also, there was a moderate association between the LEFS and the physical component scores and several subscales of SF-36, but not with the mental component scores. Conclusion: The Taiwan Chinese version of the LEFS questionnaire is a valid and reliable measure of health status for patients with lower extremity disorders. ? 2012.[SDGs]SDG3adult; aged; article; biomechanics; confidence interval; construct validity; correlation coefficient; female; human; internal consistency; knee fracture; Lower Extremity Functional Scale; major clinical study; male; mental health; principal component analysis; prospective study; reliability; running; Short Form 36; sitting; social interaction; standing; Taiwan; validity; walking; health status; leg; middle aged; physiology; questionnaire; reproducibility; validation study; Adult; Aged; Female; Health Status; Humans; Lower Extremity; Male; Middle Aged; Prospective Studies; Questionnaires; Reproducibility of Results; Taiwanjournal article10.1016/j.jfma.2012.07.032247461172-s2.0-84898814634