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Construct and criterion validity of the Malaysia version of Lower Extremity Functional Scale (LEFS)
Muhammad Ariff Mohd Yunus1, Ramli Musa2, Mohd Yusof Nazri1
1Department of Orthopedic & Rehabilitation, Kulliyyah of Medicine, International Islamic University Malaysia, Jalan Hospital, 25150 Kuantan, Pahang, Malaysia.
Objective:
The objective of this study is to translate the Lower Extremity Functional Scale (LEFS) into the Malay language and to validate the resulting version.
Methods:
A two-stage observational study was conducted. The LEFS was initially cross-culturally adapted to Malay language through double forward and backward translation. The finalized version of Malay LEFS (M-LEFS) was subsequently validated for both construct validity and criterion validity. Participants (n = 208) with normal lower limb condition and various lower limb conditions completed the M-LEFS.
Results:
Reliability of M-LEFS revealed excellent Cronbach's alpha value of 0.98. Construct validity, evaluated using exploratory factor analysis, exhibited good factor loadings (>0.6) of all 20 items. Interestingly, we extracted 2 components which was not reported elsewhere. With a cut-off point of 60, the sensitivity of the scale was 99% and the specificity was 81%.
Conclusions:
The M-LEFS had very good psychometric properties among the studied population. Further studies are needed to enhance these preliminary outcomes in Malaysia.
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