Table 1.

Characteristics of Eligible Studies Considered in the Meta-Analysis

					Drug-resistant					Drug-responsive
ID	First author	Year	Ethnicity	Genotyping methods	GG	GA	AA	G	A	GG	GA	AA	G	A	HWE
1	Seo (Japan)	2008	Asian	PCR	102	29	2	233	33	104	35	7	243	49	0.087
2	Kim (Korea)	2009	Asian	RT-PCR	162	35	1	359	37	165	27	1	357	29	0.926
3	Ufer (Germany)	2009	Caucasian	PCR-RFLP	66	48	4	180	56	56	37	10	149	57	0.298
4	Ufer (Germany)	2011	Caucasian	PCR	119	48	9	286	66	14	16	2	44	20	0.355
5	Kwan (China)	2011	Asian	Mass array	193	65	0	451	65	255	60	4	570	68	0.825
6	Qu (China)	2012	Asian	PCR-RFLP	181	35	1	397	37	262	56	2	580	60	0.593

PCR, polymerase chain reaction; RFLP, restriction fragment length polymorphism; HWE, Hardy–Weinberg equilibrium; RT-PCR, reverse transcription PCR.