Fig. 1—
Receiver-operating characteristic curve comparing baseline arterial oxygen tension (Pa,O2;___), baseline forced expiratory volume in one second (% pred; ----) and the result of the hypoxia inhalation test (Pa,O2after inhalation of a gas mixture with an inspiratory oxygen fraction of 0.15 for 15 min; – – – ) for the prediction of mountainPa,O2on arrival (cut-off 6.6 kPa (50 mmHg); …: reference line).