Helicobacter pylori Infection Is Strongly Associated With Gastric and Duodenal Ulcers in a Large Prospective Study  Ben Schöttker, Mariam A. Adamu, Melanie N. Weck, Hermann Brenner  Clinical Gastroenterology and Hepatology  Volume 10, Issue 5, Pages 487-493.e1 (May 2012) DOI: 10.1016/j.cgh.2011.12.036 Copyright © 2012 AGA Institute Terms and Conditions

Figure 1 Origin of the study populations used for the estimation of the associations of H pylori infection with (1) the lifetime history of peptic ulcer disease (cross-sectional analysis), (2) incident gastric ulcers, and (3) incident duodenal ulcers (longitudinal analyses). aIf either of the 2 following definitions were met: (1) PG I < 25 ng/mL or (2) PG I < 70 ng/mL and PG I/PG II < 3. bChronic atrophic gastritis could not be determined because of a missing serum sample. cNumber of gastric and duodenal ulcers do not add up to 69 because of 1 study participant who developed both a gastric and a duodenal ulcer. Clinical Gastroenterology and Hepatology 2012 10, 487-493.e1DOI: (10.1016/j.cgh.2011.12.036) Copyright © 2012 AGA Institute Terms and Conditions