Association study of promoter polymorphisms at the dopamine transporter gene in Attention Deficit Hyperactivity Disorder

Table 3 Results of the TDT Analysis of the Haplotypes for -67A/T and -839C/T Polymorphisms

	Haplotype	Transmitted	Freq-T	Non-transmitted	Freq-NT	χ²	P-value
TW	-67T/-839T	60	0.69	22	0.25	12.47	0.0004
	-67T/-839C	9	0.1	17	0.2	2.5	0.11
	-67A/-839T	4	0.05	25	0.29	13.1	0.0003
	-67A/-839C	14	0.16	23	0.26	1.61	0.02
UK	-67T/-839T	20	0.42	20	0.43	0	1.00
	-67T/-839C	2	0.04	5	0.12	1.29	0.26
	-67A/-839T	2	0.04	1	0.02	0.34	0.56
	-67A/-839C	24	0.5	20	0.43	0.28	0.60
Combined samples	-67T/-839T	80	0.59	42	0.32	8.49	0.004
	-67T/-839C	11	0.08	22	0.17	3.67	0.06
	-67A/-839T	6	0.05	26	0.19	10.58	0.001
	-67A/-839C	38	0.28	43	0.32	0.23	0.63

ISSN: 1471-244X