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Absolute changes from baseline in key outcome measures at 3 and 6 months post-allocation to endoscopic lung volume reduction (ELVR) group, no-ELVR group and lung volume reduction surgery (LVRS) group. Data presented are mean±sem for a) forced expiratory volume in 1 s (FEV1), b) residual volume (RV), c) 6-min walk distance (6MWD) and d) St George's Respiratory Questionnaire (SGRQ) total score.
