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Table 1 Characteristics of included studies

From: Association of Helicobacter pylori babA2 gene and gastric cancer risk: a meta-analysis

First Author Year Country Ethnicity Control Sample Size (case/control) OR (95%CI) Quality Assessment
Gerhard 1999 Germany European Gastritis 39/23 3.31 (1.07–10.17) 5
Mizushima 2001 Japan Asian NUD 70/12 2.12 (0.58–7.68) 5
Yamaoka 2002 United States North American Gastritis 47/23 0.74 (0.27–2.02) 5
Yamaoka 2002 Colombia South American Gastritis 62/19 2.08 (0.72–6.00) 5
Oliveira 2003 Brazil South American Gastritis 53/75 2.73 (1.32–5.67) 7
Han 2004 Shanghai Asian Chronic gastritis 40/24 0.71 (0.25–2.08) 6
Lee 2006 South korea Asian Routine gastoscopy 98/136 3.98 (1.94–8.15) 7
Chomvarin 2007 Thailand Asian NUG 72/6 1.32 (0.14–12.13) 6
Zhang 2008 China Asian Gastritis 143/69 1.07 (0.59–1.94) 6
Erzin 2008 Turkey Asian NUD 36/34 31.07 (8.22–117.52) 6
Bartchewsky 2009 Brazil South American Gastritis 142/38 0.96 (0.44–2.12) 6
Safaei 2010 Iran Asian CAG 38/16 1.87 (0.35–9.96) 5
Mattar 2010 Brazil South American Gastritis 36/32 0.38 (0.14–1.02) 5
Saxena 2011 India Asian NUD 45/123 1.12 (0.49–2.57) 7
Abadi 2011 Iran Asian NUD 55/50 53.65 (11.67–246.69) 5
Mottaghi 2014 Iran Asian Chronic gastritis 60/12 0.65 (0.18–2.31) 6
Abdi 2016 Iran Asian NAG 22/61 2.81 (1.02–7.74) 6
Roman-Roman 2017 Mexico South American Chronic gastritis 109/282 1.93 (0.83–4.50) 7
Heidari 2017 Iran Asian Gastritis 32/22 1.12 (0.35–3.57) 5
Bartpho 2020 Thailand Asian Chronic gastritis 90/24 7.38 (2.64–20.09) 6
  1. NUD Non-ulcer Dyspepsia, NAG Non-atrophic gastritis, CAG Chronic active gastritis