Table 1.

Genetic distribution of the sample.

	DAT1 gene
	Alleles		10r Allele		Genotype
	10	9	Pr	Ab	10–10	10–9	9–9
Valid n	169	85	110	17	59	51	17
Frequency	0.67	0.33	0.87	0.13	0.47	0.40	0.13