Table 1. Characteristics of studies of 5-HTTLPR polymorphism included in this meta-analysis.

First author/Year	Country	Ethnicity	Source of control	Cases/Controls	Cases	Controls
					LL/LS/SS	LL/LS/SS	HWE	L%
Safarinejad/2009	Iran	Caucasian	PB	82/82	24/29/29	35/30/17	No	0.61
Janssen/2009	the Netherlands	Caucasian	HB	89/92	27/43/19	27/41/24	Yes	0.52
Luo/2011	China	Asian	HB	119/90	24/34/61	25/31/34	No	0.45
Ozbek/2009	Tukey	Caucasian	PB	69/69	11/21/37	12/37/20	Yes	0.44
Zuccarello/2012	Italy	Caucasian	PB	89/100	22/49/18	33/51/16	Yes	0.59
Jern/2012	Finland	Caucasian	PB	33/33	13/15/5	12/16/5	Yes	0.61