TABLE 2.

Demographic data

Characteristic	Mean ± SD	n
Age, years	64±18	27
Men, %	57	27
Height, cm	163±10	25
Weight, kg	70±16	25
Chronic obstructive pulmonary disease, %	93	27
FVC, L	2.48±1.02	20
FVC, % predicted	76±25	20
FEV1, L	1.41±0.71	20
FEV1, % predicted	58±22	20
FEV1/FVC	58±17	20
FEV1/FVC, % predicted	79±23	20
Residual volume, L	2.01±1.16	14
Diffusion capacity, mL/min/mmHg	12.19±5.73	13
Baseline blood gases
SpO2, %	95±3	27
PaCO2, mmHg	38±5	27
PaO2, mmHg	75±10	27
Post-HAST blood gases
SpO2, %	89±3	27
PCO2, mmHg	37±4	27
PO2, mmHg	58±7	27

FEV₁ Forced expiratory volume in 1 s; FVC Forced vital capacity; HAST Hypoxia altitude simulation test; PaCO₂ Partial pressure of arterial carbon dioxide at sea level; PCO₂ Partial pressure of carbon dioxide; PaO₂ Partial pressure of arterial oxygen; PO₂ Partial pressure of oxygen; SpO₂ Baseline saturation of peripheral oxygen