. 2014 Oct 20;15:117. doi: 10.1186/s12881-014-0117-2

Table 1.

Characteristics of studies included in the meta-analysis

First author	Year	Location	Genotyping method	No. of cases	No. of controls	Cases			Controls			P _HWE for control
First author	Year	Location	Genotyping method	No. of cases	No. of controls	CC	CG	GG	CC	CG	GG	P _HWE for control
Okubo	2010	Japan	PCR-RFLP	552	697	236	243	73	254	322	121	0.2776
Zeng	2010	China	PCR-RFLP	304	304	89	153	62	119	132	53	0.1223
Hishida	2011	Japan	PCR-CTPP	583	1637	230	271	82	633	775	229	0.7381
Zhou F	2012	China	TaqMan MGB	1686	1895	286	822	578	393	951	551	0.6407
Zhou Y	2012	China	Locus-specific PCR	299	416	107	146	46	127	215	74	0.301
Ahn	2013	Korea	PCR-RFLP	461	447	159	231	71	164	221	62	0.3618
Dikeakos	2014	Greece	PCR-RFLP	163	480	105	45	13	307	149	24	0.2892
Kupcinskas	2014	Europe	Real Time-PCR	362	347	16	94	252	16	108	223	0.5311
Pu	2014	China	PCR-RFLP	197	513	65	96	36	143	274	96	0.0801