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Table 1 Demographic characteristics of the population centres included in the study.

From: A population-based survey of the epidemiology of symptom-defined gastroesophageal reflux disease: the Systematic Investigation of Gastrointestinal Diseases in China

 

Shanghaia

(N = 13.5 m) %

Beijingb

(N = 11.8 m) %

Wuhanb

(N = 7.8 m) %

Xi'anb

(N = 7.3 m) %

Guangzhoub

(N = 7.3 m) %

Female

50.6

50.0

49.7

50.0

45.4

Urban

54.2

57.5

58.6

50.4

55.7

Age (years)

     

18-29

13.3

25.6

31.1

27.8

31.9

30-39

18.8

21.5

19.6

25.7

28.5

40-49

30.2

22.0

20.3

19.9

17.8

50-59

16.4

15.1

15.5

12.9

11.5

60-69

12.4

9.3

8.0

8.8

6.3

70-80

9.1

6.5

5.5

5.0

4.0

  1. aData from the fifth population census in China (2000) [43, 44].
  2. bData from the government 1% sample survey (2005) [45–47].
  3. m, million.