Fig. 2

Prevalence estimates of Helicobacter pylori infection over time in Chinese studies (numbers by data points indicate source reference citations). Data are reported for a all included datasets (n = 28), b datasets that used serum IgG assays to detect H. pylori infection (n = 20), c datasets that included individuals recruited from urban areas only (n = 9), d datasets that included individuals recruited from rural areas only (n = 11), e datasets that used serum IgG assays to detect H. pylori infection and included individuals recruited from urban areas only (n = 6), and f datasets that used serum IgG assays to detect H. pylori infection and included individuals recruited from rural areas only (n = 9). IgG immunoglobulin G