Table 2.

Seven case-control studies of H. pylori vs. precancerous lesion of stomach[32-38]

No.	Cases		Controls		OR	95%CI	χ²	P value
	Hp (+)	Hp (-)	Hp (+)	Hp (-)
1	344	194	1467	1311	1.585	1.309～1.918	22.089	0.000
2	67	29	175	180	2.376	1.466～3.851	11.955	0.000
3	103	38	26	53	5.525	3.036～10.056	31.988	0.000
4	427	252	992	892	1.524	1.273～1.824	20.736	0.000
5	99	41	12	28	5.634	2.614～12.144	20.128	0.000
6	134	35	272	201	2.829	1.870～4.282	24.490	0.000
7	188	27	332	135	2.831	1.805～4.442	20.836	0.000
Summary	1362	616	3276	2800	2.5635	1.8477～3.5566	31.7540	0.000