Table 3. CYP2C9 allele frequencies in East Asian populations.

Populations	n	CYP2C9 allele frequency				Reference
		*1	*2	*3	*13
Korean	4308	0.949 (0.942–0.956)	0.000 (0.000–0.000)	0.046 (0.040–0.052)	0.005 (0.003–0.007)	Present study#
Chinese	2174	0.964	0.000	0.036	ND	14
	1008	0.967	0.000	0.033	ND	15
	788	0.963	0.001	0.036	ND	16
	400	0.975	0.000	0.025	ND	8
	338	0.967	0.000	0.033	ND	17
	230	0.983	0.000	0.017	ND	18
	204	0.951	0.000	0.049	ND	19
	796	0.958	0.001	0.041	ND	9
	658	-	-	-	0.006	20
	294	-	-	-	0.010	21
Sum of Chinese	5938(952)*	0.964 (0.959–0.969)	0.003 (0.002–0.004)	0.035 (0.030–0.040)	0.007 (0.003–0.011)
Japanese	1000	0.966	0.000	0.034	ND	9
	1448	0.968	0.000	0.032	ND	22
	1200	0.979	0.000	0.021	ND	23
	524	0.968	0.000	0.031	0.002	10
	436	0.979	0.000	0.021	ND	24
	400	0.965	0.000	0.035	ND	8
	280	0.982	0.000	0.018	ND	25
	236	0.970	0.000	0.030	ND	26
	246	0.955	0.000	0.045	ND	27
	294	0.993	0.000	0.007	ND	28
Sum of Japanese	6064 (524)&	0.972 (0.968–0.976)	0.000 (0.000–0.000)	0.028c (0.024–0.032)	0.002 (0.000–0.005)

Values in parentheses represent 95% confidence intervals; n=number of alleles; differences between frequency data were calculated using the chi-square test. ND=Not determined.

^#, Data were combined with a previous study⁵.

^*,^&, Values in parentheses represent the total numbers with the CYP2C9^*13 allele.

^cP<0.01 between present study and sum of Japanese (95% CI on the difference 0.010–0.026).