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Table 3 Descriptive characteristics of included association studies between BDNF gene Val66Met polymorphism and subtyped bipolar disorders

From: Association between brain-derived neurotrophic factor genetic polymorphism Val66Met and susceptibility to bipolar disorder: a meta-analysis

Study

Year

Ancestry

Diagnostic criteria

Patient’s phenotype

Cases

Controls

Case Val

Controls Val

Bipolar I disorder

Nakata et al. [39]

2003

Japanese

DSM-IV

BPI

100

190

118

220

Kunugi et al. [40]

2004

Japanese

DSM-IV

BPI

347

588

412

702

Lohoff et al. [43]

2005

Caucasian

DSM-IV

BPI

621

998

1020

1576

Green et al. [46]

2006

Caucasian

DSM-IV

BPI

864

2100

1418

3404

Tramontina et al. [48]

2007

Caucasian

DSM-IV

BPI

114

137

183

230

Xu et al. [54]

2010

Han Chinese

DSM-IV

BPI

416

501

451

546

Wang et al. [56]

2012

Han Chinese

DSM-IV

BPI

281

386

288

436

Chang et al. [30]

2013

Han Chinese

DSM-IV

BPI

286

349

294

361

Bipolar II disorder

Nakata et al. [39]

2003

Japanese

DSM-IV

BPII

30

190

34

220

Kunugi et al. [40]

2004

Japanese

DSM-IV

BPII

172

588

203

702

Green et al. [46]

2006

Caucasian

DSM-IV

BPII

98

2100

159

3404

Xu et al. [54]

2010

Han Chinese

DSM-IV

BPII

82

501

74

546

Wang et al. [56]

2012

Han Chinese

DSM-IV

BPII

56

386

53

436

Chang et al. [30]

2013

Han Chinese

DSM-IV

BPII

681

349

668

361