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Table 1 Characteristics of the studies included in the meta-analysis (n = 16)

From: Angiotensin-converting enzyme gene insertion/deletion polymorphism and susceptibility to psoriasis: a systematic review and meta-analysis

Genotyping

Study, year

Ethnicity

Psoriasis

Control

Source of controls

Subtype of psoriasis

Genotyping method

P-value for HWE for controls

Scorea

II

ID

DD

II

ID

DD

Vasku, 1999 [21]

Caucasian (European)

40

111

49

45

104

59

Unknown

Unknown

PCR

0.947

NA

Ozkur, 2004 [22]

Caucasian (Turkish)

12

40

34

28

69

57

Unknown

Vulgaris (94.2%)

PCR

0.378

7

Al-Awadhi, 2007 [23]

Caucasian (Arab)

7

19

25

14

45

41

Hospital- based

Arthritis

PCR

0.770

8

Chang, 2007 [24]

Asian

172

108

32

287

265

63

Hospital- based

Unknown

PCR

0.873

7

Liu, 2007 [20]

Asian

31

38

19

23

48

24

Hospital- based

Unknown

PCR

0.917

NA

Weger, 2007 [25]

Caucasian (European)

61

92

54

35

93

54

Hospital- based

Vulgaris

PCR

0.653

7

Nagui, 2012 [26]

Caucasian (Arab)

9

13

8

6

8

6

Hospital- based

Vulgaris

PCR

0.371

8

Shehab, 2008 [27]

Caucasian (Arab)

2

2

9

19

18

74

Hospital- based

Arthritis

PCR

< 0.001

6

Veletza, 2008 [28]

Caucasian (European)

2

11

14

5

7

15

Unknown

Vulgaris

PCR

0.038

7

Coto-Segura, 2009 [29]

Caucasian (European)

38

124

106

34

145

93

Population- based

Arthritis

PCR

0.050

6

Yang, 2014 [9]

Asian

350

269

49

304

299

65

Hospital- based

Unknown

PCR-RFLP

0.491

7

Munir, 2016 [30]

Caucasian (Pakistani)

118

239

129

88

299

184

Population- based

Arthritis (92%)

PCR

0.063

6

Huang, 2017 [31]

Asian

55

71

35

119

111

26

Hospital- based

Unknown

PCR

0.987

6

Agha, 2018 [32]

Caucasian (Pakistani)

72

87

74

90

122

51

Unknown

Unknown

PCR

0.405

6

Elneam, 2018 [33]

Caucasian (Arab)

18

33

22

22

17

8

Unknown

Vulgaris

PCR

0.157

7

Tanhapour, 2018 [34]

Caucasian (Iranian)

16

57

27

8

50

42

Hospital- based

Unknown

PCR-RFLP

0.191

6

  1. Abbreviations: PCR Polymerase chain reaction; RFLP restriction fragment length polymorphism. aBased on the Newcastle-Ottawa Quality Assessment Scale