Table 1 The inclusion criteria for the HAC, HAPC and LLC groups
| Â | HAC group | HAPC group | LLC group |
|---|---|---|---|
Age limit | 18–55 years of age | 18–55 years of age | 18–55 years of age |
Residence | resident of Tibet (> 3600 m) for more than 10 years | Resident of Tibet (> 3600 m) for more than 10 years | Resident of Chengdu (≈ 500 m) |
Hemoglobin concentration requirement | 120 g/L < males ≤ 185 g/L, 115 g/L < females ≤ 165 g/L | Males ≥ 210 g/L, Females ≥ 190 g/L | 120 g/L < males ≤ 185 g/L, 115 g/L < females ≤ 165 g/L |