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Table 1 List of studies included in the meta-analysis

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

    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%