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. Author manuscript; available in PMC: 2011 Jan 1.

Published in final edited form as: Psychiatr Q. 2009 Dec;80(4):213–218. doi: 10.1007/s11126-009-9108-4

Table 1.

Adolescent cannabis use and COMT genotype and allele frequencies in African American and Caucasian patients with psychotic disorders

Race			Use of cannabis prior to age 18
			Yes	No	Total	Chi-square, df, P
African American	Genotype	Met/Met	4	0	4	2.9, 2, P = 0.23
		Met/Val	18	9	27
		Val/Val	13	10	23

	Alleles	Met	26	9	35	2.04, 1, P = 0.15
	Alleles	Val	44	29	73	2.04, 1, P = 0.15

Caucasian	Genotype	Met/Met	7	2	9	1.45, 2, P = 0.49
		Met/Val	11	9	20
		Val/Val	6	3	9

	Alleles	Met	25	13	38	0.23, 1, P = 0.63
	Alleles	Val	23	15	38	0.23, 1, P = 0.63