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Table 1 Characteristics of included studies for MTHFR C677T polymorphism

From: Association between MTHFR C677T/A1298C and susceptibility to autism spectrum disorders: a meta-analysis

Author, year

Quality Score

Country

Ethnicity

Case

Control

Sample source

Folate

HWE

N

CC

CT

TT

N

CC

CT

TT

   

Boris et al. 2004 [22]

6

USA

Caucasian

168

35

94

39

5389

2570

2213

606

Hospital-based

YES

0

James et al. 2006 [43]

7

USA

Caucasian

356

134

176

46

205

93

90

22

Hospital-based

YES

0.974

Mohammad et al. 2009 [35]

7

USA

Asian

138

98

35

5

138

120

18

0

Population-based

NO

0.412

Pasca et al. 2009 [27]

8

Romania

Caucasian

39

21

14

4

80

46

28

6

Population-based

NO

0.551

dos Santos et al. 2010 [28]

7

Brazil

Caucasian

151

60

68

23

100

45

41

14

Hospital-based

YES

0.353

Liu et al. 2011 [44]

7

Canada

Caucasian

205

68

98

39

384

177

166

41

Population-based

YES

0.823

Liu et al. 2011 [44]

7

Canada

Caucasian

400

167

179

54

384

177

166

41

Population-based

YES

0.823

Schmidt et al. 2011 [45]

8

USA

Caucasian

294

128

133

33

180

74

77

29

Population-based

YES

0.241

Guo et al. 2012 [31]

7

China

Asian

186

79

77

30

186

87

83

16

Population-based

NO

0.542

Divyakolu et al. 2013 [46]

6

India

Asian

50

27

22

1

50

42

8

0

Hospital-based

NO

0.539

Park et al. 2014 [47]

7

Korea

Asian

249

76

136

37

423

139

204

80

Hospital-based

NO

0.737

Sener et al. 2014 [48]

9

Turkey

Caucasian

98

44

51

3

70

37

33

0

Population-based

NO

0.009

Shawky et al. 2014 [46]

6

Egypt

Caucasian

20

7

10

3

22

16

6

0

Hospital-based

NO

0.459

Meguid et al. 2015 [49]

8

Egypt

Caucasian

24

11

11

2

30

20

8

2

Population-based

NO

0.361

El-baz et al. 2017 [32]

6

Egypt

Caucasian

31

12

15

4

39

35

4

0

Hospital-based

YES

0.735

Zhao et al. 2013 [36]

9

China

Asian

200

91

59

50

200

144

39

17

Hospital-based

NO

0