6MWD	6-minute walking distance
AVX	artery–vein phenotyping analysis
BMI	body mass index
BSA	body surface area
COPD	chronic obstructive pulmonary disease
CT	computed tomography
FEV1% predicted	forced expiratory volume in 1 second as percent predicted
FVC% predicted	forced vital capacity as percent predicted
GOLD	global initiative for chronic obstructive lung disease
%LAA-950	percentage of low attenuation area below 950 Hounsfield Units
mMRC scale	modified Medical Research Council dyspnea scale
Pi10	square root of wall area for a theoretical airway with a lumen of 10 mm
PRISm	preserved ratio impaired spirometry
QCT	quantitative computed tomography
SpO2	oxygen saturation in arterial blood estimated by pulse oximetry