Table 1.

Frequencies of alleles for each gene, by sex.

		Males	Females	Total
DRD2 C957T	TT	11 (32.4%)	10 (27.8%)	21
	TC	14 (41.2%)	20 (55.6%)	34
	CC	9 (26.5%)	6 (16.7%)	15
5HTTLPR	Absence of Short	11 (32.4%)	12 (32.4%)	23
	Presence of Short	23 (67.6%)	25 (67.6%)	48
DRD4	Absence of 7	25 (75.8%)	25 (75.8%)	50
	Presence of 7	8 (24.2%)	8 (24.2%)	16
SLC6A3	Absence of 9	21 (61.8%)	19 (51.4%)	40
	Presence of 9	13 (38.2%)	18 (48.6%)	31
OPRM1	AA	25 (73.5%)	26 (70.3%)	51
	AG or GG	9 (26.5%)	11 (29.7%)	20
ANKK1 TaqIA	TT or TC	18 (52.9%)	16 (47.1%)	34
	CC	16 (50%)	16 (50%)	32