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Table 1 Descriptive characteristics of 13 studies on the role of COMT val158/met polymorphism in suicidal behavior

From: No association between COMT val158met polymorphism and suicidal behavior: meta-analysis and new data

Study

Sample Size n

(cases-control)

Location

Diagnosis

Number of Met alleles in cases

Gender (Male/female)

Mean Age

     

Cases

Control

Cases

Control

Ohara 1998 [40]

12-135

Japanese

Suicide Attempt

13

    

Russ 2000 [34]

51-51

Caucasians

Suicide Ideation

46

32/19

28/23

38.1

41

Nolan 2000 [37]

84-64

US and Finnish

Suicide Attempt

77

59/15

48/16

32

41

Liou 2001 [39]

62-188

Chinese, Asiatic

Suicide Attempt

29

26/36

97/91

36.7

38.6

Rujescu 2003 [38]

328-149

German, Caucasian

Suicide Attempt

159

53/96

149/179

38.6

40

Ono 2004 [1]

163-169

Japanese, Asiatic

Completed Suicide

111

112/51

114/55

 

46.4

Baud 2007 [36]

427-185

Switzerland and France

Suicide Attempt

388

  

46.0

38.7

Zalsman 2008 [35]

201-119

Caucasian-European

Suicide Attempt

220

  

41.6

41.2

Perroud 2010 [29]

875

France and Switzerland

Suicide Attempt

784

256/619

 

39.6

 

Lee 2011 [5]

197-170

Korean

Suicide Attempt

121

70/127

85/85

49.3

50.7

Nedic 2011 [33]

82-311

Croatian, Caucasians

Alcohol Dependence, Suicide Attempt

108

59/23

255/58

50.46

50.70

Tovilla-Zárate 2011

105-236

Mexican

Suicide Attempt

84

55/50

132/104

30.5

34.5