IL4 and gastritis: Joint examination of the above mentioned two variables placed double positive (HP-NAP-seropositive/-590T carrier) subjects at a 9.7 fold (OR=9.70, 95% CI=2.06-45.69) amplified risk of gastritis, in reference to double negatives (HP-NAP seronegative/IL-4 -590 CC; Fig. 2A).