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Table 1 Main characteristics of all the eligible studies in this meta-analysis

From: Glutathione S-transferase M1 null genotype meta-analysis on gastric cancer risk

First author Year Ethnicity Control source Sample size Case Control
Case Control Present Null Present Null
Strange et al. 1991 Caucasian Hospital-based 19 49 5 14 29 20
Harada et al. 1992 Asian Population-based 19 84 14 5 44 40
Kato et al. 1996 Asian Hospital-based 64 120 34 30 59 61
Katoh et al. 1996 Asian Population-based 139 126 60 79 71 55
Deakin et al. 1996 Caucasian Hospital-based 136 577 64 72 261 316
Enders et al. 1998 Caucasian Hospital-based 51 35 23 28 22 13
Martins et al. 1998 Caucasian Hospital-based 148 84 77 71 40 44
Oda et al. 1999 Asian Hospital-based 147 112 56 91 57 55
Cai et al. 1999 Asian Population-based 95 94 35 60 51 43
Setiawan et al. 2000 Asian Population-based 87 419 45 42 207 212
Lan et al. 2001 Caucasian Population-based 347 426 180 167 204 222
Saadat et al. 2001 Caucasian Population-based 42 131 16 26 78 53
Gao et al. 2002 Asian Population-based 153 223 63 90 90 133
Wu et al. 2002 Asian Hospital-based 356 278 183 173 142 136
Sgambato et al. 2002 Caucasian Hospital-based 8 100 3 5 47 53
Choi et al. 2003 Asian Population-based 80 177 34 46 82 95
Roth et al. 2004 Asian Population-based 90 454 66 24 309 145
Suzuki et al. 2004 Asian Hospital-based 145 177 58 87 93 84
Colombo et al. 2004 Mixed Population-based 100 150 53 47 88 62
Lai et al. 2005 Asian Hospital-based 123 121 50 73 66 55
Li et al. 2005 Asian Hospital-based 100 62 33 67 36 26
Mu et al. 2005 Asian Population-based 196 393 69 127 158 235
Nan et al. 2005 Asian Hospital-based 400 614 149 251 254 360
Shen et al. 2005 Asian Hospital-based 142 675 41 71 314 361
Palli et al. 2005 Caucasian Population-based 175 546 85 90 271 275
Tamer et al. 2005 Caucasian Hospital-based 70 204 30 40 116 88
Nan et al. 2005 Asian Hospital-based 107 220 34 73 90 130
Hong et al. 2006 Asian Hospital-based 108 238 48 60 104 134
Agudo et al. 2006 Caucasian Population-based 242 927 120 122 434 498
Martinez et al. 2006 Caucasian Population-based 87 329 54 33 180 149
Boccia et al. 2007 Caucasian Hospital-based 105 256 48 59 119 135
Ruzzo et al. 2007 Caucasian Population-based 79 112 44 35 51 61
Wideroff et al. 2007 Caucasian Population-based 116 209 55 61 87 121
Tripathi et al. 2008 Caucasian Population-based 76 100 45 31 61 39
Al-Moundhri et al. 2009 Caucasian Population-based 107 107 65 42 75 32
Masoudi et al. 2009 Caucasian Hospital-based 67 134 30 37 74 60
Malik et al. 2009 Caucasian Hospital-based 108 195 44 64 116 79
Moy et al. 2009 Caucasian Population-based 170 735 72 98 320 415
Zendehdel et al. 2009 Caucasian Population-based 181 624 54 70 230 239
Palli et al. 2010 Caucasian Population-based 296 546 206 90 271 275
Yadav et al. 2010 Asian Hospital-based 133 270 84 49 150 120
Luo et al. 2010 Asian Hospital-based 123 129 30 93 58 71
Nguyen et al. 2010 Asian Hospital-based 59 109 16 43 34 75
Darazy et al. 2011 Caucasian Hospital-based 13 70 7 6 58 12
García-González et al. 2012 Caucasian Hospital-based 557 557 274 283 290 267
Malakar et al. 2012 Asian Population-based 102 204 45 57 107 97
Jing et al. 2012 Asian Hospital-based 410 410 170 240 203 207