Table 2 Distribution of genotype and allele of BDNF polymorphism between cases and controls

rs6265(G/A)

GG

GA

AA

G

A

Salih et al.

cases

288

196 (68.1%)

84 (29.2%)

8 (2.8%)

476 (82.6%)

100 (17.4%)

controls

288

217 (75.3%)

66 (22.9%)

5 (1.7%)

500 (86.8%)

76 (13.2%)

Heidi et al.

cases

201

131 (65.2%)

64 (31.8%)

6 (3.0%)

326 (81.1%)

76 (18.9%)

controls

246

171 (69.5%)

68 (27.6%)

7 (2.8%)

410 (83.3%)

82 (16.7%)

Heidi et al.

cases

411

265 (64.5%)

129 (31.4%)

17 (4.1%)

659 (80.2%)

163 (19.8%)

controls

546

373 (68.3%)

156 (28.6%)

17 (3.1%)

902 (82.6%)

190 (17.4%)

Carolina et al.

cases

188

118 (62.8%)

64 (34.0%)

6 (3.2%)

300 (79.8%)

76 (20.2%)

controls

287

183 (63.8%)

95 (33.1%)

9 (3.1%)

461 (80.3%)

113 (19.7%)

Martin et al.

cases

265

148 (55.9%)

104 (39.2%)

13 (4.9%)

400 (75.5%)

130 (24.5%)

controls

153

88 (57.5%)

57 (37.3%)

8 (5.2%)

233 (76.1%)

73 (23.9%)

Meta-analysis

cases

1353

858 (63.4%)

445 (32.9%)

50 (3.7%)

2161 (79.9%)

545 (20.1%)

controls

1520

1032 (67.9%)

442 (29.1%)

46 (4.5%)

2506 (82.4%)

534 (17.6%)

rs2049046(A/T)

AA

AT

TT

A

T

Salih et al.

cases

288

64 (22.2%)

147 (51.0%)

77 (26.7%)

275 (47.7%)

301 (52.3%)

controls

288

82 (28.5%)

128 (44.4%)

78 (27.1%)

292 (50.7%)

284 (49.3%)

Heidi et al.

cases

235

46 (19.6%)

115 (48.9%)

74 (31.5%)

207 (44.0%)

263 (56.0%)

controls

244

60 (24.6%)

128 (52.5%)

56 (23.0%)

248 (50.8%)

240 (49.2%)

Heidi et al.

cases

549

111 (20.2%)

279 (50.8%)

159 (29.0%)

501 (45.6%)

597 (54.4%)

controls

561

135 (24.1%)

280 (49.9%)

146 (26.0%)

550 (49.0%)

572 (51.0%)

Carolina et al.

cases

188

51 (27.1%)

99 (52.7%)

38 (20.2%)

201 (53.5%)

175 (46.5%)

controls

287

79 (27.5%)

143 (49.8%)

65 (22.6%)

301 (52.4%)

273 (47.6%)

Meta-analysis

cases

1260

272 (21.6%)

640 (50.8%)

348 (27.6%)

1184 (47.0%)

1336 (53.0%)

controls

1380

356 (25.8%)

679 (49.2%)

345 (25.0%)

1391 (50.4%)

1369 (49.6%)