![]() ![]() The LEFS is reliable, and construct validity was supported by comparison with the SF-36. The potential error associated with a score on the LEFS at a given point in time is ±5.3 scale points (90% CI), the minimal detectable change is 9 scale points (90% CI), and the minimal clinically important difference is 9 scale points (90% CI). There was a higher correlation between the prognostic rating of change and the LEFS than between the prognostic rating of change and the SF-36 physical function score. Correlations between the LEFS and the SF-36 physical function subscale and physical component score were r =.80 (95% lower limit CI=.73) and r =.64 (95% lower limit CI=.54), respectively. Test-retest reliability of the LEFS scores was excellent ( R =.94 ). ![]() Spearman rank-order correlation coefficients were used to examine the relationship between an independent prognostic rating of change for each patient and change in the LEFS and SF-36 scores. Pearson correlations and one-way analyses of variance were used to examine construct validity. A type 2,1 intraclass correlation coefficient was used to estimate test-retest reliability. The SF-36 (acute version) was administered during the initial assessment and at weekly intervals. The LEFS was administered during the initial assessment, 24 to 48 hours following the initial assessment, and then at weekly intervals for 4 weeks. The LEFS was administered to 107 patients with lower-extremity musculoskeletal dysfunction referred to 12 outpatient physical therapy clinics. The purpose of this study was to assess the reliability, construct validity, and sensitivity to change of the Lower Extremity Functional Scale (LEFS). TL DR: The LEFS is reliable, and construct validity was supported by comparison with the SF-36, and the sensitivity to change of the LEFS was superior to that of theSF-36 in this population.Ībstract: Background and Purpose. ![]()
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