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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.
Abstract:
The minimum important difference (MID) for the incremental shuttle walk test (ISWT) in individuals with long covid was estimated using anchor-based and distribution-based methods. 397 participants (56 ± 13 years; 63.7% male) with long covid completed a 6-week rehabilitation programme and rated perceived change using the Global Rating of Change Scale (GRCS). Change in ISWT distance differed across GCRS categories (p<0.05); participants reporting slight improvement increased ISWT distance by 60.7±85.9 m. Receiver operating characteristic analysis identified an optimal cut-off of 35 m (area under the curve 0.70, 95% CI 0.61 to 0.79; p<0.05). Distribution-based methods yielded MID estimates of 40.1 m and 52.5 m, supporting an MID range of 35-60.7 m.
