TABLE 2.

Heterogeneity analysis with fixed-effect model.

SNP	Group	Genetic model	N	I2	P
rs2284411	overall	TT + CT vs. CC	6	30.80%	0.205
		TT vs. CC + CT	6	0.00%	0.914
		CT vs. TT + CC	6	33.80%	0.182
		TT vs. CC	6	0.00%	0.904
		CT vs. CC	6	34.80%	0.176
		T vs C	6	13.00%	0.331
	Chinese subgroup	TT + CT vs. CC	2	0.00%	0.732
		TT vs. CC + CT	2	0.00%	0.664
		CT vs. TT + CC	2	0.00%	0.573
		TT vs. CC	2	0.00%	0.696
		CT vs. CC	2	0.00%	0.616
		T vs. C	2	0.00%	0.887
	Korean subgroup	TT + CT vs. CC	4	57.70%	0.069
		TT vs. CC + CT	4	0.00%	0.955
		CT vs. TT + CC	4	57.20%	0.072
		TT vs. CC	4	0.00%	0.899
		CT vs. CC	4	58.80%	0.064
		T vs. C	4	46.90%	0.13
rs2229193	overall	TT + CT vs. CC	4	0.00%	0.935
		TT vs. CC + CT	4	0.00%	0.663
		CT vs. TT + CC	4	0.00%	0.92
		TT vs. CC	4	0.00%	0.669
		CT vs. CC	4	0.00%	0.919
		T vs. C	4	0.00%	0.954
rs3792452	overall	AA+ GA vs. GG	3	0.00%	0.522
		AA vs. GG + GA	3	0.00%	0.546
		GA vs. AA+ GG	3	0.00%	0.626
		AA vs. GG	3	0.00%	0.537
		GA vs. GG	3	0.00%	0.605
		A vs. G	3	0.00%	0.475

I ^ 2: measure to quantify the degree of heterogeneity in meta-analyses.