Oxygen saturation, haemoglobin concentration and mean pulmonary artery pressure
| N | SpO2 (%) | Hb (g/dl) | PAPm (mm Hg) | |
| Low altitude | ||||
| SMO | 182 | 96.5±6.4 | 15.8±2.1 | 15.6±3.1 |
| CON | 200 | 97.2±6.8 | 15.5±1.4 | 15.1±2.8 |
| After arrival at altitude | ||||
| SMO | 182 | 82.5±5.2 | 16.0±1.8 | 17.5±4.5 |
| CON | 200 | 83.2±5.8 | 15.8±1.6 | 16.2±3.6 |
| After 3 months | ||||
| SMO | 182 | 84.8±4.6* | 16.2±1.8‡ | 22.4±4.4¶ |
| CON | 200 | 86.4±5.7 | 15.8±1.5 | 21.5±3.8 |
| After 6 months | ||||
| SMO | 182 | 84.6±6.3* | 17.4±1.6§ | 23.1±4.8** |
| CON | 200 | 86.6±5.7 | 16.2±1.5 | 21.7±4.1 |
Data are presented as mean±SD.
↵* SMO versus CON: p=0.004.
†SMO versus CON: p=0.001.
↵‡ SMO versus CON: p=0.021.
↵§ SMO versus CON: p<0.001.
↵¶ SMO versus CON: p=0.044.
↵** SMO versus CON: p=0.004.
SMO, smoking group; CON, control group; Hb, haemoglobin concentration; PAPm, mean pulmonary artery pressure; SpO2, arterial oxygen saturation.