Table 1

Urinary mephenytoin S/R ratios in Han and Bai subjects separated by genotype

Ethnic Origin	CYP2C19 Genotype	n	S/R Ratio
Han	wt/wt	32	0.17 + 0.03
	m1/wt	42	0.27 + 0.02^1-b
	m2/wt	7	0.26 + 0.03^1-c
	m1/wt + m2/wt	49	0.27 + 0.02^1-b
	m1/m1 + m1/m2 + m2/m2 (PMs)	20	1.00 + 0.02^1-a
	wt/wt + m1/wt + m2/wt (EMs)	81	0.23 + 0.02^1-c

Bai	wt/wt	102	0.16 + 0.01
	m1/wt	64	0.27 + 0.02^1-a
	m2/wt	9	0.24 + 0.03^1-b
	m1/wt + m2/wt	73	0.26 + 0.02^1-a
	m1/m1 + m1/m2 + m2/m2 + m1/Trp₄₃₃ (PMs)	27	0.99 + 0.02^1-a
	wt/wt + m1/wt + m2/wt (EMs)	175	0.21 + 0.01^1-b ^, ^1-d