↵^a Values shown as X (SD) or n (%), unless otherwise indicated. ABC=Activities-specific Balance Confidence, BBS=Berg Balance Scale, BESTest=Balance Evaluation Systems Test, BMI=body mass index, FEV₁=forced expiratory volume in 1 second, GOLD=Global Initiative for Chronic Obstructive Lung Disease, IQR=interquartile range, M=median, mMRC=modified Medical Research Council dyspnea scale.