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Table 2 Distribution of alleles and genotypes in each included studies

From: Association between alcohol dehydrogenase-2 gene polymorphism and esophageal cancer risk: a meta-analysis

First author

Cases

Controls

 

Arg/Arg

Arg/His

His/His

Arg

His

Arg/Arg

Arg/His

His/His

Arg

His

HWE

 

(*1/*1)

(*1/*2),

(*2/*2)

(*1)

(*2)

(*1/*1)

(*1/*),

(*2/*2)

(*1)

(*2)

 

Yokoyama A

56

56*

 

–

–

145

381*

  

–

–

Boonyaphiphat P

101

86

15

288

116

94

139

28

327

195

0.08

Chao YC

19

41

28

79

97

7

43

55

57

153

0.94

Yokoyama T

51

73

109

175

291

31

212

367

274

946

0.99

Chen HG

26

54

57

106

168

14

49

74

77

197

0.40

Yang CX

6

85

74

97

233

22

168

304

212

776

0.98

Hashibe M

163

4*

 

–

–

792

95*

 

–

–

–

Yang SJ

33

80

78

146

236

22

76

100

120

276

0.44

Guo YM

17

25

38

59

101

24

168

288

216

744

0.99

Lee CH

117

149

140

383

429

46

275

335

367

945

0.59

Akbai

21

232

490

274

1212

73

471

827

617

2125

0.86

Cui R

194

363

510

751

1383

151

986

1626

1288

4238

0.99

Ding JH

19

96

106

134

308

8

75

108

91

291

0.53

Tanaka F

149

237

356

535

949

49

287

484

385

1255

0.76

Iqbal B

12

36

2

60

40

12

37

1

61

39

0.30

Wang YL

15

34

33

64

100

17

67

78

101

223

0.90

Gu HY

53

168

158

274

484

26

170

182

222

534

0.26

Dura P

326

20

0

672

20

406

23

0

835

23

0.85

Gao Y

252

907

939

1411

2785

199

909

1155

1307

3219

0.57

Wu M

138

309

355

585

1019

101

410

510

612

1430

0.38

Hou AM

59*

 

51

–

–

48*

 

62

–

–

–

Ye B

224

400

377

848

1154

150

578

663

878

1904

0.36

Babiker H

115

8

2

238

12

188

18

4

394

26

0.06

  1. HWE Hardy-Weinberg Equilibrium;–, not applicable; *for Yokoyama A and Hashibe M means His/His+Arg/His; *for Hou AM means Arg/His+Arg/Arg