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Ten-Item Lower Extremity Functional Scale (LEFS-10): Instrument Reduction Based on Brazilian Patients With Lower Limb Dysfunction

Published:September 29, 2022DOI:https://doi.org/10.1016/j.apmr.2022.09.010

      Highlights

      • The 10-item version of the lower extremity functional scale had better internal structure than the long version of this instrument.
      • The 10-item version of the lower extremity functional scale had better internal structure than other reduced versions of this instrument already proposed in the literature.
      • The 10-item version of the lower extremity functional scale correlated properly with the long version of this instrument.

      Abstract

      Objective

      To propose a short version of the lower extremity functional scale (LEFS), to compare our short version with the different structures proposed for the LEFS by the specialized literature, and to verify the criterion validity of the best structure of the LEFS identified in our study.

      Design

      Cross-sectional observational study.

      Setting

      Physiotherapy clinics.

      Participants

      We included 140 patients with lower limb dysfunction (N=140).

      Interventions

      None.

      Main Outcome Measures

      We used confirmatory factor analysis (CFA), χ2/degree of freedom (DF), comparative fit index (CFI), Tucker-Lewis index (TLI), root mean square error of approximation (RMSEA), standardized root mean squared residual (SRMR), Akaike information criterion (AIC), and Bayesian information criterion (BIC). The method of reducing the number of items of the LEFS considered the modification indices and factor loadings.

      Results

      The body site most affected by pain was the knee (71.4%), and the most common diagnoses were knee osteoarthritis (55%) and anterior knee pain (11.4%). LEFS reduction generated a 1-dimensional structure of the LEFS with 10 items (LEFS-10). When compared with other structures, the LEFS-10 presented the best fit indices (χ2/DF=1.88, CFI=0.975, TLI=0.968, RMSEA=0.079, and SRMR=0.058) and the lowest values of AIC (3287.063) and BIC (3345.896). LEFS-10 presents a high correlation (Spearman's correlation coefficient [ρ]=0.911, P<.001) with the 20-item LEFS.

      Conclusion

      LEFS-10 is the proposal for a short version of the instrument with the most adequate internal structure, in addition to being satisfactorily correlated with the longer version of the instrument.

      Keywords

      List of abbreviations:

      AIC (Akaike information criterion), BIC (Bayesian information criterion), CFA (confirmatory factor analysis), CFI (comparative fit index), COSMIN (Consensus-based Standards for the selection of health Measurement Instruments), DF (degree of freedom), LEFS (lower extremity functional scale), RMSEA (root mean square error of approximation), SRMR (standardized root mean squared residual), TLI (Tucker-Lewis index)
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