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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