Systematic review and meta-analysis: the relationship between the Helicobacter pylori dupA gene and clinical outcomes

Table 1 List of studies included in the meta-analysis

			Gastritis			Duodenal ulcer			Gastric ulcer			Gastric cancer
Authors	Country	Reference	Positive	all		positive	all		positive	all		positive	all
Lu	Japan	7	7	50	14.0%	11	30	36.7%	13	50	26.0%	3	30	10.0%
Lu	Korea	7	2	30	6.7%	24	65	36.9%	5	30	16.7%	3	50	6.0%
Lu	Colombia	7	15	40	37.5%	22	45	48.9%	12	30	40.0%	6	50	12.0%
Arachchi	India	20	16	70	22.9%	36	96	37.5%
Argent	South Africa	8	11	15	73.3%	12	13	92.3%				16	18	88.9%
Argent	Belgium	8	29	76	38.2%	20	40	50.0%				10	19	52.6%
Argent	USA	8	9	20	45.0%	9	21	42.9%	2	3	66.7%
Argent	China	8	3	12	25.0%	2	11	18.2%	2	5	40.0%	1	1	100.0%
Douraghi	Iran	9	34	68	50.0%	15	30	50.0%	9	23	39.1%	20	36	55.6%
Gomes	Brazil	10	133	144	92.4%	110	126	87.3%				71	81	87.7%
Hussein	Iraq	21	5	29	17.2%	9	15	60.0%	2	5	40.0%
Pacheco	Brazil	23	18	29	62.1%	13	20	65.0%	14	24	58.3%
Zhang	China	24	51	133	38.3%	46	101	45.5%	11	47	23.4%	19	79	24.1%
Schmidt	Sweden	11	13	20	65.0%	7	11	63.6%				13	21	61.9%
Schmidt	China	11	15	52	28.8%	10	16	62.5%				12	22	54.5%
Nguyen	Japan	12	23	78	29.5%	17	62	27.4%	17	59	28.8%	10	34	29.4%
Yeh	Taiwan	22	24	94	25.5%	13	57	22.8%	6	30	20.0%

ISSN: 1757-4749