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Table 1 Characteristics of individual studies included in the meta-analysis

From: Prognostic significance of Epstein-Barr virus infection in gastric cancer: a meta-analysis

Study Region Year EBV-positive/EBV-negative Statistical methodology HR estimation Study quality score
Gonzalez CA Europe 2003 4/83 UA HR + 95 % CI 6/9
Chow WH Europe 1999 11/76 UA HR + 95 % CI 5/9
Kim RH Asia 2010 18/229 UA HR + 95 % CI 9/9
Gulley ML Americas 1996 11/84 UA HR + 95 % CI 8/9
Corvalán A Americas 2005 22/71 UA HR + 95 % CI 9/9
van Beek J Europe 2004 41/525 UA survival curves 8/9
He Y Asia 2012 21/97 UA HR + 95 % CI 7/9
Herrera-Goepfert R Americas 2005 8/127 UA HR + 95 % CI 5/9
Corvalan A Americas 2001 27/118 UA HR + 95 % CI 6/9
Koriyama C Asia 2007 49/100 UA HR + 95 % CI 8/9
Boysen T Europe 2011 18/168 UA HR + 95 % CI 7/9
Nakao M Asia 2011 20/351 UA HR + 95 % CI 5/9
Sukawa Y Asia 2012 18/204 UA HR + 95 % CI 7/9
Chiaravalli AM Europe 2006 18/78 UA RR + 95 % CI 7/9
Gao Y Asia 2009 21/1018 UA HR + 95 % CI 7/9
Kijima Y Asia 2003 25/334 UA HR + 95 % CI 9/9
Koriyama C Asia 2002 64/128 MA HR + 95 % CI 6/9
Park ES Asia 2009 50/407 MA HR + 95 % CI 7/9
Song HJ Asia 2010 123/405 UA HR + 95 % CI 8/9
Grogg KL Americas 2003 7/103 UA RR + 95 % CI 9/9
Zhao J Asia 2012 80/631 UA survival curves 7/9
Huang SC Asia 2014 51/943 UA HR + 95 % CI 8/9
Lee HS Asia 2004 63/1051 UA HR + 95 % CI 7/9
Truong CD Americas 2009 12/223 MA RR + 95 % CI 8/9
  1. Abbreviations: EBV Epstein-Barr Virus, HR hazard ratio, CI confidence interval, UA univariate analysis, MA multivariate analysis