Fig. 1From: Assessment of prevalence and risk factors of helicobacter pylori infection in an oilfield Community in Hebei, ChinaAge-specific prevalence of Helicobacter pylori infection diagnosed by a 13C-urea breath test. There was a marked difference between age groups (P = 0.0045) and an increasing trend of prevalence with age (P trend = 0.008)Back to article page