ACQ	asthma control questionnaire
Ai	luminal area
Ao	cross-sectional area of airway
COPD	chronic obstructive pulmonary disease
FEV1	forced expiratory volume in one second
Fres	resonant frequency
FVC	forced vital capacity
HRCT	high-resolution computed tomography
IOS	impulse oscillometry
IQR	interquartile range
MEF75	maximal expiratory flow at 75% of the FVC
MEF50	maximal expiratory flow at 50% of the FVC
MEF25	maximal expiratory flow at 25% of the FVC
MMEF	maximal mid-expiratory flow
PEF	peak expiratory flow
Pi10	inner airway perimeter of 10 mm
Rc	central resistance
Rp	peripheral resistance
RV	residual volume
R5	resistance at 5 Hz
R20	resistance at 20 Hz
TLC	total lung capacity
T/OR	ratio of airway wall thickness to the outer radius
WT	wall thickness
WA%	wall area percentage
X5	reactance at 5 Hz
Z5	impedance value at 5 Hz