Table 1.

Main information extracted from eligible studies in the meta-analysis.

Author/year	Country	Ethnicity	Control source	Genotyping method	Case						Control						P (HWE)
					Number	TT	TC	CC	T	C	Number	TT	TC	CC	T	C
Jiao/2007	China	Asian	Hospital-based	PCR-RFLP	118	86	29	3	201	35	225	194	31	0	419	31	0.267
Huang/2009	China	Asian	Hospital-based	PCR-RFLP	220	145	66	9	356	84	195	150	41	4	341	49	0.548
Wang/2009	China	Asian	Hospital-based	PCR-RFLP	45	29	15	1	73	17	60	51	9	0	111	9	0.530
Zheng/2009	China	Asian	Hospital-based	Real-time PCR	126	99	25	2	223	29	118	100	18	0	218	18	0.370
Ma/2011	China	Asian	Hospital-based	Allele-specific PCR	46	28	17	1	73	19	56	47	9	0	103	9	0.513
Zhang/2012	China	Asian	Hospital-based	PCR-RFLP	675	530	135	10	1195	155	636	556	74	6	1186	86	0.052
Zheng/2014	China	Asian	Hospital-based	Direct sequencing	206	165	39	2	369	43	209	170	35	4	375	43	0.180

PCR – polymerase chain reaction; PCR-RFLP – PCR-restriction fragment length polymorphism; P (HWE) – P value for Hardy-Weinberg equilibrium test.