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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) [4547].
  3. m, million.
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