Table 1.
Characteristics of included studies
| 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 |
NUD Non-ulcer Dyspepsia, NAG Non-atrophic gastritis, CAG Chronic active gastritis