Reliability and concurrent validity of L test under dual-task conditions in people with multiple sclerosis

Functional assessments of mobility are crucial for managing the symptoms of people with Multiple Sclerosis(pwMS). Impairment in dual-task skills, which is seen in pwMS, can have a negative effect on daily living activities. The purpose of this study was to determine validity and the intra-rater and inter-rater reliability of the L-test under dual-task conditions in pwMS. In total, 47 pwMS were included in the study. The L-test with single and dual task was administered along with the timed up and go (TUG) test, 25-foot walk (T25-FW) test by two rater. The tests were repeated seven to ten days later. According to the results of the study; the intra-rater and inter-rater reliabilities of the L-test under dual-task conditions were excellent (intraclass correlation coefficient intra-rater= 0.915, 0.922 and inter-rater= 0.96, 0.970), a significant positive relationship was found between the L test in dual-task conditions and the TUG (p < 0.001, r = 0.673), the T25-FW (p = 0.024, r = 0.328), and the L test with single and the TUG and the T25-FW (p < 0.001, r = 0.743, p= 0.002, r = 0.432) The L test under dual-task conditions is a reliable and valid tool for the assessment of cognitive ability on functional mobility in PwMS.