Reliability and Validity of the L Test in Persons With Multiple Sclerosis

Area of Science:

• Neurology
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Balance and gait disorders are significant challenges for individuals with multiple sclerosis (PwMS).
• Accurate and reliable assessment tools are crucial for monitoring disease progression and treatment efficacy in PwMS.
• The L Test is a novel tool developed to evaluate balance and gait impairments.

Purpose of the Study:

• To evaluate the test-retest reliability of the L Test in persons with multiple sclerosis (PwMS).
• To assess the concurrent validity of the L Test against established functional mobility measures.
• To determine the measurement error (SEM and MDC) of the L Test for PwMS.

Main Methods:

• 82 persons with multiple sclerosis (PwMS) underwent two L Test administrations within a one-day interval.
• Test-retest reliability was assessed using Bland-Altman analysis and intra-class correlation coefficients (ICCs).
• Concurrent validity was examined by correlating L Test results with the Timed Up and Go (TUG) test and the 10-minute Walk Test (10MWT).

Main Results:

• The L Test demonstrated excellent test-retest reliability (ICC = 0.996) and reproducibility.
• Strong correlations were found between the L Test and both the TUG test (rho = 0.936) and 10MWT (rho = 0.925).
• The Standard Error of Measurement (SEM) was 0.35 seconds, and the Minimal Detectable Change (MDC) was 0.97 seconds.

Conclusions:

• The L Test is a highly reliable and valid instrument for assessing functional mobility and balance in persons with multiple sclerosis (PwMS).
• Its strong correlation with established tests supports its utility in clinical and research settings for PwMS.
• The L Test provides precise measurements with low error, making it suitable for tracking changes in PwMS over time.