. Author manuscript; available in PMC: 2012 Nov 1.

Published in final edited form as: J Am Acad Child Adolesc Psychiatry. 2011 Sep 15;50(11):1129–1139.e2. doi: 10.1016/j.jaac.2011.08.002

Table 2.

Allele Frequencies and Genotype Classifications (N=89)

Gene Description	Allele	Allele Frequency	Genotype	Genotype Frequency(N)
Adrenergic α_2A–receptor −1291 C>G SNP	C	67%	CC	47%(42)
	G	33%	CG	39%(35)
			GG	13%(12)

Catechol-O-methyltransferase Val158Met SNP	Val	56%	Val/Val	34%(30)
	Met	44%	Val/Met	45%(40)
			Met/Met	21%(19)

Dopamine transporter 3’ untranslated region VNTR	+10	77%	+10/+10	61%(54)
	9	20%	+10/−10	34%(30)
	8,11	3%	−10/−10	6%(5)

Dopamine receptor D₄ exon 3 VNTR	4	58%	+4/+4	31%(28)
	7	20%	+4/−4	54%(48)
	2,3,5,6,8,10	22%	−4/−4	15%(13)

Note: SNP=Single Nucleotide Polymorphism; VNTR=Variable Nucleotide Tandem Repeat