. 2014 Aug 11;2014:624573. doi: 10.1155/2014/624573

Table 1.

Baseline characteristics and methodological quality of all included studies.

First author	Year	Country	Ethnicity	Sample size		Gender (M/F)		Age (years)		Genotyping method	SNP type	HWE test (P value)	NOS score
First author	Year	Country	Ethnicity	DN	DM	DN	DM	DN	DM	Genotyping method	SNP type	HWE test (P value)	NOS score
Bonnefond [18]	2013	France	Caucasian	1510	10581	917/593	6739/3842	64.3 ± 10.0	62.9 ± 10.1	TaqMan	rs6921438 Y/X	0.953	7
									60.4 ± 9.7		rs10738760 Y/X	0.095
Nikzamir [23]	2012	Iran	Asian	255	235	129/126	106/129	59.6 ± 8.1	58.4 ± 7.6	PCR-RFLP	rs2010963 G/C	0.401	6
Xiao [25]	2011	China	Asian	111	105	63/48	55/50	63.4 ± 6.8	60.5 ± 6.2	PCR-ASA	rs699947 G/A	0.118	7
Zhang [26]	2008	China	Asian	102	92	54/48	44/48	59.9 ± 12.4	61.6 ± 10.4	PCR-RFLP	rs3025039 C/T	0.063	7
Zhang [34]	2008	China	Asian	173	123	—	—	63.7 ± 10.6	62.7 ± 9.9	PCR-RFLP	rs3025039 C/T	0.581	7
Guo [30]	2008	China	Asian	81	76	41/40	35/41	59.6 ± 10.9	57.1 ± 10.9	PCR-RFLP	rs2010963 G/C	0.425	7
											rs833061 C/T	0.172
Xue [33]	2007	China	Asian	97	60	44/53	29/31	—	65.6 ± 11.6	PCR-RFLP	−2549 D/I	0.368	8
McKnight [22]	2007	UK	Caucasian	242	301	149/93	122/179	17.6 ± 9.0	15.9 ± 8.4	Pyrosequencing	rs3025039 C/T	0.712	7
										TaqMan	rs699947 G/A	0.182
										Pyrosequencing	rs2010963 G/C	0.055
Buraczynska [24]	2007	Poland	Caucasian	245	91	126/119	43/48	57.9 ± 10.7	56.9 ± 9.8	PCR-RFLP	−2549 D/I	0.679	8
											rs2010963 G/C	0.652
He [31]	2007	China	Asian	129	120	64/65	56/64	62.9 ± 12.0	61.6 ± 15.3	PCR-RFLP	rs3025039 C/T	0.661	7
Li [32]	2005	China	Asian	104	112	58/54	50/48	62.1 ± 7.0	60.0 ± 6.8	PCR-RFLP	rs2010963 G/C	0.511	8

DN: diabetic nephropathy; DM: diabetes mellitus; M: male; F: female; SNP: single nucleotide polymorphism; PCR-RFLP: polymerase chain reaction-restriction fragment length polymorphism; PCR-ASA: polymerase chain reaction-amplicon sequence analysis; HWE: Hardy-Weinberg equilibrium; NOS: the Newcastle-Ottawa Scale.