Table 2.

Affective symptoms and COMT genotype and allele frequencies in African American and Caucasian patients with psychotic disorders

Race			Affective symptoms
			Yes	No	Total	Chi-square, df, P
African American	Genotype	Met/Met	3	1	4	1.01, 2, P = 0.6
		Met/Val	14	13	27
		Val/Val	11	12	23
	Alleles	Met	20	15	24	0.58,1, P = 0.45
		Val	36	37	32
Caucasian	Genotype	Met/Met	4	5	9	3.9, 2, P = 0.14
		Met/Val	14	6	20
		Val/Val	3	6	9
	Alleles	Met	22	16	38	0.21, 2, P = 0.65
		Val	20	18	38