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Incidence rates of gastric cancer stratified by age, sex, and serological status. Subjects older than 60 years in group D showed the highest annual incidence of 1.8% in males and 1.5% in females. The incidence rate in the same age group was much lower in groups A and B, being less than 0.5% per year. Hp-Ab, Helicobacter pylori antibody.
