Incidence of acute mountain sickness-related symptoms in 17–21-year-old native Tibetan and Han Chinese students after arrival in Lhasa
| Symptoms | Headache n (%) | Gastrointestinal symptoms n (%) | Fatigue n (%) | Dizziness n (%) | Difficulty sleeping n (%) | |
| Tibetan by train | None | 449 (61.0) | 683 (93.1) | 523 (71.2) | 599 (81.4) | 670 (91.2) |
| Mild | 241 (32.7) | 42 (5.7) | 148 (20.1) | 119 (16.2) | 30 (4.1) | |
| Moderate | 44 (6.0) | 6 (0.8) | 45 (6.1) | 13 (1.8) | 23 (3.1) | |
| Severe | 2 (0.3) | 3 (0.4) | 19 (2.6) | 5 (0.7) | 12 (1.6) | |
| Han Chinese by train | None | 178 (45.1) | 268 (67.8) | 183 (46.3) | 204 (51.6) | 239 (60.5) |
| Mild | 166 (42.0) | 97 (24.6) | 137 (34.7) | 164 (41.5) | 85 (21.5) | |
| Moderate | 32 (8.1) | 19 (4.8) | 51 (12.9) | 24 (6.1) | 40 (10.1) | |
| Severe | 19 (4.8) | 11 (2.8) | 24 (6.1) | 3 (0.8) | 31 (7.8) | |
| Han Chinese by air | None | 118 (29.1) | 251 (61.8) | 132 (32.5) | 148 (36.5) | 222 (54.7) |
| Mild | 202 (49.8) | 114 (28.1) | 166 (40.9) | 205 (50.5) | 106 (26.1) | |
| Moderate | 69 (17.0) | 37 (9.1) | 78 (19.2) | 49 (12.1) | 50 (12.3) | |
| Severe | 17 (4.2) | 4 (1.0) | 30 (7.4) | 4 (1.0) | 28 (6.9) |
Data are presented as number with frequencies (%).