Table 2.

Comparison of allele frequencies of CYP2C9 reported from different ethnic populations.

	Frequency (P value vs Egyptians)
Population	n	*1	*2	*3	Reference
Egyptians	494	0.820	0.120	0.060	Present study
Caucasians
American	200	0.860	0.080 (NS)	0.060 (NS)	[6]
British	200	0.790	0.125 (NS)	0.085 (NS)	[5]
Swedish	860	0.819	0.107 (NS)	0.074 (NS)	[8]
Turkish	998	0.794	0.106 (NS)	0.100 (NS)	[25]
Asians
Japanese	436	0.979	0 (<0.0001)	0.021 (0.0020)	[26]
Korean	1148	0.989	0 (<0.0001)	0.011 (<0.0001)	[27]
Chinese-Taiwanese	196	0.974	0 (<0.0001)	0.026 (NS)	[6]
African-Americans	200	0.985	0.010 (<0.0001)	0.005 (0.0004)	[6]

n, total number of alleles.

Differences in allele frequencies were measured by Fisher exact test.

NS indicates that there were no significant differences (P > 0.05).