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