Table 1.

The characteristics of the enrolled studies in this meta-analysis.

First author	Year	Country	Ethnicity	Source of control	Genotyping method	Sample size (cases/controls)	HWE
Tanguturi	2013	India	Asian	PB	PCR-RFLP	202/210	0.097
Anand	2009	Mixed	Mixed	Mixed	IlluminaGoldenGate technology	4017/4017	0.091
Al-Bustan	2009	Kuwaiti	Asian	HB	PCR-RFLP	88/122	<0.050
Koch	2008	Germany	Caucasian	PB	TaqMan	3657/1211	0.558
Ranjith	2004	Indian	African	PB	PCR-RFLP	195/300	<0.050
Keavney	2004	UK	Caucasian	PB	PCR-RFLP	4685/3460	–
Keavney	2003	UK	Caucasian	PB	PCR-RFLP	4484/5757	0.463
Mamotte	2003	Australia	Caucasian	PB	PCR-RFLP	359/639	0.732
Wang	2001	Xinjiang	Asian	PB	PCR-RFLP	54/71	0.479
Raslova	2001	Bratislava	Caucasian	PB	PCR-RFLP	71/71	0.183
Batalla	2000	Asturias	Caucasian	PB	PCR-RFLP	220/200	0.776
Joven	1998	Spanish	Caucasian	PB	PCR-RFLP	250/250	0.109
Luc	1994	Belfast	Caucasian	PB	NA	183/176	0.405
Luc	1994	Lille	Caucasian	PB	NA	64/150	0.932
Luc	1994	Strasbourg	Caucasian	PB	NA	187/172	0.35
Luc	1994	Toulouse	Caucasian	PB	NA	140/182	0.698
Lenzen	1986	NA	Caucasian	PB	NA	570/624	0.081
Kolovou	2002	Greek	Caucasian	PB	PCR-RFLP	124/240	0.552
Kumar	2003	North India	Asian	PB	PCR-RFLP	35/45	<0.050
Baum	2006	Hong Kong	Asian	HB	PCR-RFLP	234/336	0.659
Nakai	1998	Japan	Asian	PB	PCR-RFLP	254/422	0.175
Hergenc	1995	Turkish	Caucasian	PB	PCR-RFLP	50/60	0.117
Utermann	1984	Germany	Caucasian	PB	NA	523/1031	<0.050

NA: not available; PB: population based; HB: hospital based; PCR-RFLP: restriction fragment length polymorphism; HWE: Hardy–Weinberg equilibrium. –: the data of the study are not enough.