Table 1. Results of pooled ORs in the meta-analysis.

Group	N	Case/control	OR (95% CI)	P
Overall	34	34679/41186	1.09(0.88,1.34)	0.42
Cancer type
Gastric	9	1447/2633	1.22(0.88,1.70)	0.23
Breast	3	28443/29463	1.13(0.77,1.67)	0.52
Hepatocellular	4	500/667	1.44(0.82,2.52)	0.21
Others	18	4289/8423	0.99(0.66,1.50)	0.97
Ethnicity
Caucasian	16	32165/38090	1.14(0.91,1.43)	0.27
Asian	18	2514/3096	0.97(0.58,1.61)	0.89