Table 2.

RR of H. pylori and CagA status for future noncardial gastric cancer

RR (95% CI)P
CAG2.4 (1.8-3.3)<0.001
H. pylori IgG(−)1.0 (reference)
H. pylori IgG(+), CagA < 152.2 (1.3-3.9)0.0052
H. pylori IgG(+), CagA ≥ 15, <233.9 (2.1-7.0)<0.001
H. pylori IgG(+), CagA ≥ 232.0 (1.3-3.2)0.0022
Current smoker2.3 (1.4-3.5)<0.001
Stomach dose (1 Gy), nonsmokers*2.1 (1.2-3.1)0.0019
Stomach dose (1 Gy), smoker*1.0 (0.7-1.4)>0.5
  • Abbreviation: 95% CI, 95% confidence interval.

  • * An interaction term between stomach dose and current smoking was included in a conditional logistic regression model. In the table, the RR of stomach dose (1 Gy) is shown separately for nonsmokers and for smokers for the sake of simplicity.