Table 1.

Eleven case-control studies of H. pylori vs. gastric cancer[21-31]

No.	Cases		Controls		OR	95%CI	χ²	P value
	Hp (+)	Hp (-)	Hp (+)	Hp (-)
1	61	13	49	25	2.394	1.110～5.163	4.284	0.038
2	13	3	78	68	3.778	1.033～13.818	3.475	0.062
3	71	21	46	46	3.381	1.791～6.384	13.52	0.000
4	99	23	6	8	5.793	1.841～18.155	8.400	0.004
5	35	16	34	87	5.597	2.746～11.408	22.873	0.000
6	101	35	6236	4628	2.142	1.455～3.151	14.959	0.000
7*	16	9	32	43	2.389	0.937～6.092	2.618	0.106
8*	21	19	3	12	4.421	1.080～18.093	3.457	0.063
9*	55	21	12	10	2.183	0.821～5.805	1.75	0.186
10	90	13	89	50	3.889	1.977～7.653	15.500	0.000
11	60	25	35	50	3.429	1.815～6.475	13.743	0.000
Summary	622	198	6620	5027	3.0016	2.4197～3.7234	99.9483	0.000

^*the literatures that did not attain significant results.