Figure 3.

Results of H.pylori antigen test in oral diseases groups. Positive rates of H. pylori were 63.42% (541 of 853), 66.91% (184 of 275), 50% (5 of 10) and 54.07% (73 of 135) among subjects with periodontal disease, caries, recurrent aphthous stomatitis and control group, respectively. Patients with periodontal disease and caries had significant higher prevalence of H. pylori than controls (χ²=4.331, P<0.05; χ²=6.377, P<0.05, respectively), while difference between recurrent aphthous stomatitis and control group was not statistically significant (χ2=0.062, P>0.5).