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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