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Minimum important difference for the incremental shuttle walk test in long covid rehabilitation
Molly M Baldwin1,2, Enya Daynes3,2, Rachael A Evans3,2
1Division of Respiratory Sciences, University of Leicester, Leicester, UK mb985@leicester.ac.uk.
Thorax
|August 5, 2026
Summary
The minimum important difference for the incremental shuttle walk test in long covid patients is 35-60.7 meters. This finding aids in assessing rehabilitation progress for individuals with long covid.
Area of Science:
- Rehabilitation Medicine
- Clinical Measurement
- Long Covid Research
Background:
- Long covid presents diverse challenges, impacting physical function and requiring validated outcome measures.
- The incremental shuttle walk test (ISWT) is a key metric for assessing exercise capacity in this population.
- Establishing the minimum important difference (MID) for the ISWT is crucial for interpreting patient-reported outcomes and clinical significance.
Purpose of the Study:
- To determine the minimum important difference (MID) for the incremental shuttle walk test (ISWT) in individuals experiencing long covid.
- To utilize both anchor-based and distribution-based methodologies for robust MID estimation.
- To provide a clinically meaningful range for assessing changes in ISWT performance post-rehabilitation.
Main Methods:
- Anchor-based method using the Global Rating of Change Scale (GRCS) to correlate perceived changes with ISWT performance.
- Distribution-based methods to calculate MID estimates based on statistical variability.
- Receiver operating characteristic (ROC) analysis to identify the optimal ISWT change threshold indicating meaningful improvement.
Main Results:
- A statistically significant difference in ISWT distance change was observed across GRCS categories (p<0.05).
- Participants reporting slight improvement showed an average ISWT increase of 60.7±85.9 meters.
- ROC analysis indicated an optimal MID cut-off of 35 meters (AUC=0.70, p<0.05), with distribution-based methods yielding estimates of 40.1m and 52.5m.
Conclusions:
- The study supports a minimum important difference (MID) range of 35-60.7 meters for the ISWT in long covid patients.
- These findings provide valuable benchmarks for clinicians and researchers to interpret ISWT results in the context of long covid rehabilitation.
- The established MID enhances the clinical utility of the ISWT for evaluating treatment effectiveness and patient recovery trajectories.
