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Table 3 Characteristics of the studies evaluating effects of the GSTM1-GSTT1 dual-null genotype on bladder carcinogen risk

From: Association of Glutathione S-transferase gene polymorphism with bladder Cancer susceptibility

Author, Year

Country

Ethnicity

Source of controls

Quality score

Case

Control

null-null

non-null-null

total

null-null

non-null-null

total

Abdel-Rahman 1998

Egypt

African

Hospital-based

8

14

23

37

3

31

34

Steinhoff 2000

Germany

Caucasian

Hospital-based

7

12

123

135

4

123

127

Schnakenberg 2000

Germany

Caucasian

Population-based

6

12

145

157

31

192

223

Ma 2002

China

Asian

Population-based

8

16

45

61

54

128

182

Lee 2002

Korea

Asian

Hospital-based

8

83

149

232

37

128

165

Srivastava 2004

India

Asian

Hospital-based

7

16

90

106

9

173

182

Moore 2004

USA

Mix

Population-based

8

9

97

106

6

103

109

Hung 2004

France

Caucasian

Hospital-based

7

28

173

201

19

195

214

Srivastava 2005

India

Asian

Population-based

10

17

89

106

32

338

370

McGrath 2006

USA

Mix

Population-based

11

18

173

191

78

844

922

Song 2009

China

Asian

Hospital-based

11

77

131

208

50

162

212

Salinas-Sonchez 2011

Spain

Caucasian

Hospital-based

5

20

131

151

6

88

94

Ovsiannikov 2012

Germany

Caucasian

Hospital-based

6

17

179

196

29

206

235

Henriquez-Hernondez 2012

Spain

Caucasian

Hospital-based

8

17

73

90

8

73

81

Berber 2013

Turkey

Caucasian

Hospital-based

7

11

103

114

7

107

114

Safarinejad 2013

Iran

Asian

Hospital-based

10

38

128

166

73

259

332

Ceylan 2015

Turkey

Caucasian

Hospital-based

8

8

57

65

8

62

70

Elhawary 2017

Saudi Arabia

Asian

Hospital-based

7

0

104

104

0

208

208