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Relationship between changes in 6MWT (Δ: t2 − t1) relative to baseline (t1) and stratified performance scores (T2D). A total of 575 patients with COPD were evaluated through the six-minute walking test (6MWT) before (t1) and after (t2) outpatient pulmonary rehabilitation. There is a negative correlation (r = −0.30, p < 0.001 ***) between the baseline (abscissa) and changes (ordinate).
