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Construct validity and reliability of the 2-minute step test in patients with lumbar spinal stenosis
Nurdan Paker1, Büşra Şirin Ahısha1, Nur Kesiktaş1
1Department of Physical Therapy and Rehabilitation, Istanbul Physical Medicine and Rehabilitation Hospital, University of Health Sciences, Istanbul, Turkey.
Aim:
This study aimed to investigate the validity and reliability of the 2-Minute Step Test (2MST) in patients with lumbar spinal stenosis (LSS).
Method:
This cross-sectional study involved 55 volunteers, aged 18-80, diagnosed with lumbar spinal stenosis. The participants were assessed using the 2MST, the 2-Minute Walk Test (2MWT), the 6-Minute Walk Test (6MWT), the Visual Analogue Scale (VAS), and the Oswestry Disability Index (ODI). To evaluate the reliability of the 2MST, test-retest reliability was determined by administering the 2MST again after a 7-day interval. The reliability analysis included the intraclass correlation coefficient (ICC) with a 95% confidence interval (CI), standard error of measurement (SEM), and minimum detectable change at the 95% confidence level (MDC95). For concurrent validity, the correlations of the 2MST with the 2MWT, 6MWT, and ODI were assessed.
Results:
The 2MST exhibited excellent test-retest reliability (ICC = 0.94, SEM = 5.56, MDC95=15.41) in LSS patients. Additionally, the 2MST showed significant correlations with the 2MWT (r = 0.842, p < 0.001), 6MWT (r = 0.819, p < 0.001), and ODI score (r = -0.722, p < 0.001).
Conclusion:
This study demonstrated that the 2MST is a valid and reliable tool for assessing exercise capacity in individuals with LSS.
Clinicaltrials.Gov Id:
NCT06060821.
