Figure 3

Quantitative increase of H. pylori antibody responses with age in H. pylori seropositives (Hp+). The median number of antigens recognized in Hp+ sera is given stratified by age group and gender. Stars indicate significant differences between genders within the same age group (P < 0.05, Fisher’s exact test). The difference in the median number of antigens recognized between the youngest and the oldest age group is indicated by the horizontal bracket (males: P > 0.05, females: P = 0.02; Wilcoxon two sample signed rank sum test).