Table 3.

Pancreatic Cancer Odds Ratio According to ABO Blood Group With Respect to Group A, in Meta-Analysis of CagA-Endemic and -Nonendemic Populations

Blood Group	Studies of Populations Endemic for CagA-Positive Helicobacter pylori		Studies of Populations Not Endemic for CagA-Positive Helicobacter pylori
	Odds Ratio	95% Confidence Interval	Odds Ratio	95% Confidence Interval
B versus A	0.76	0.66, 0.86	0.99	0.79, 1.22
AB versus A	0.82	0.67, 1.00	1.07	0.89, 1.28
O versus A	0.73	0.64, 0.85	0.74	0.62, 0.88