Table 1. Summary of the Results of the Primary and Subgroup Analysis.

	HCC positive (cases)	HCC negative (controls)	Random-effect odds ratio (95% confidence interval)
Primary analysis
Relationship between H. pylori and HCC	561/866 (64.78%)	1,718/3,585 (47.92%)	4.75 (3.06 - 7.37)
Subgroup analysis
H. pylori and HCV coinfection	168/422 (39.81%)	83/740 (11.21%)	12.76 (4.13 - 39.41)
H. pylori infection only without HCV	36/303 (11.88%)	79/495 (15.95%)	0.54 (0.11 - 2.63)
HCV only without H. pylori	84/262 (32.06%)	141/485 (29.07%)	2.21 (0.70 - 6.94)

HCC: hepatocellular carcinoma; HCV: hepatitis C virus; H. pylori: Helicobacter pylori.