Table 2.

Alleles and genotypes of the COMT Val158Met polymorphism and its association with gender in the case and control groups

	Gene/genotype	Case (n=102)	n%	Control (n=120)	n%	χ2	P-value
COMT Val158Met	A	81	39.71	102	42.50	0.249	0.563
	G	123	60.29	138	57.50
	AA	17	16.67	18	15.00	1.830	0.401
	AG	47	46.08	66	55.00
	GG	38	37.25	36	30.00
COMT Val158Met	A	14	31.82	26	40.00	2.537	0.097
Male	G	30	68.18	26	60.00
	AA	3	13.64	5	14.50	5.119	0.077
	AG	8	38.90	16	50.90
	GG	11	36.36	5	34.50
COMT Val158Met	A	67	41.87	76	44.26	0.027	0.827
Female	G	93	58.13	112	55.74
	AA	14	17.50	13	22.10	0.550	0.760
	AG	39	48.75	50	44.30
	GG	27	33.75	31	33.60

Note. COMT, Catechol-O-methyltransferase; χ² Test.