Table 2. Comparative allele frequencies of TPMT in various populations.

			Allele frequency
Populations	N	*1	*2	*3A	*3C	*6	References
Thai	400	0.950	0	0	0.050	0	Present study
		(0.924–0.969)			(0.031–0.076)
Chinese	384	0.977*	0	0	0.023*	ND	[14]
Japanese	1044	0.984**	0	0	0.016**	ND	[15]
Japanese	142	0.979**	0	0	0.014	0.007	[12]
Taiwanese	498	0.994**	0	0	0.006**	0	[17]
South-west Asians	198	0.990**	0	0.010*	0*	ND	[14]
South-east Asians	600	0.990*	0	0	0.010*	0	[17]
Kenyans	202	0.946	0	0	0.054	ND	[25]
Ghanaians	434	0.924	0	0	0.076	ND	[26]
American Caucasians	564	0.964	0.002	0.032*	0.002**	ND	[22]
British Caucasians	398	0.947	0.005	0.045*	0.003**	ND	[26]

N represents number of alleles detected. Data in parentheses represent 95% CI. ND, not detected. Different from Thai population (

^*P < 0.05 and

^**P < 0.005).