Reliability and Construct Validity of the Six-Minute Step Test in Individuals With Non-Specific Chronic Low Back Pain.
Francisco Basílio da Silva-Júnior, André Pontes-Silva, Yane Pelicer-Marques and 7 others
The six-minute step test reliably measures stepping performance and clearly separates people with chronic low back pain from healthy controls (37 fewer steps).
It is a practical stepping test, not a measure of aerobic fitness.
Key findings
1Inter-rater reliability was excellent: ICC 0.915 for the low-back-pain group and 0.973 for controls, with a standard error of measurement of 6 steps and 3 steps respectively.
2The control group completed significantly more steps than the NSCLBP group in both assessments (mean differences of 37 and 33 steps, both p < 0.001; Cohen's d = 1.91 and 1.76), supporting construct validity.
3Pain intensity increased significantly after the test in the NSCLBP group (p = 0.001 in both assessments), with a shift from mild to moderate and severe pain.
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What it does not show
The two raters assessed on different days (7 days apart), so the reliability figure mixes inter-rater agreement with test-retest and possible familiarisation effects; the authors acknowledge this. No familiarisation trial was given, which may explain the small systematic increase in the second assessment. Participants were young adults (18–42) with relatively low disability (most scored 4 or below on the Roland–Morris), recruited via a university and social media; results may not generalise to older adults or those with more severe impairment. The minimal clinically important difference for the 6MST in this population has not been established, so you cannot yet interpret a score change as clinically meaningful. Construct validity relied solely on a known-groups comparison; no convergent or discriminant validity analyses against other outcome measures were performed.
Declared interests
Funded by CAPES (Brazilian government agency, code 001), which had no role in study design, data collection, analysis, interpretation, writing, or submission. One author (Pontes-Silva) is a reviewer for the journal. No industry or device-manufacturer involvement declared.
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