Areas | Lived in high altitude for 10 years | Lived in high altitude for more than 20 years | ||||
Subjects | With symptoms (cases) | Incidence (%) | Subjects | With symptoms (cases) | Incidence (%) | |
Kunming | 40 | 19 | 47.50 | 65 | 45 | 69.23 |
Zhengzhou | 42 | 28 | 66.67 | 60 | 56 | 93.33 |
Beijing | 34 | 23 | 67.65 | 52 | 49 | 94.23 |