Table 2. Main results of pooled odds ratios (ORs) with confidence interval (CI) in the meta-analysis.

Variables	No. of studies	AA vs CC			AA vs AC			AC vs CC
		OR (95% CI)	Ph	P	OR (95% CI)	Ph	P	OR (95% CI)	Ph	P
Total	29	0.993(0.979 1.008)	0.001	0.367	1.001(0.982 1.021)	0.144	0.888	0.983(0.962 1.006)	0.000	0.143
Asian	9	0.918(0.732 1.152)	0.554	0.461	1.093(0.995 1.201)	0.367	0.065	0.846(0.670 1.068)	0.552	0.159
Caucasian	13	0.781(0.629 0.972)	0.004	0.026	0.921(0.854 0.993)	0.634	0.033	0.793(0.613 1.025)	0.000	0.077
Mixed	7	1.028(0.835 1.266)	0.058	0.795	1.034(0.959 1.115)	0.232	0.379	1.012(0.843 1.215)	0.157	0.898

P_h: P value of Q-test for heterogeneity test.