. 2020 Dec 24;7(12):e17341. doi: 10.2196/17341

Table 1.

Allele and genotype frequencies of the dopamine D4 receptor, monoamine oxidase A, serotonin-transporter, and dopamine active transporter 1 genes among males.

Genes			DRD4^a, n (%)		MAO-A^b, n (%)		5-HTTLPR^c, n (%)		DAT1^d, n (%)
Allele
	2	5 (5)		0 (0)		N/A^e		N/A
	3	3 (3)		16 (32)		N/A		N/A
	4	72 (72)		33 (66)		N/A		N/A
	5	3 (3)		1 (2)		N/A		N/A
	6	1 (1)		N/A		N/A		N/A
	7	5 (5)		N/A		N/A		N/A
	8	4 (4)		N/A		N/A		N/A
	L	N/A		N/A		48 (48)		N/A
	S	N/A		N/A		52 (52)		N/A
	9	N/A		N/A		N/A		32 (32)
	10	N/A		N/A		N/A		62 (62)
Genotype
	2R/2R	1 (2)		N/A		N/A		N/A
	2R/4R	8 (16)		N/A		N/A		N/A
	2R/5R	1 (2)		N/A		N/A		N/A
	2R/7R	1 (2)		N/A		N/A		N/A
	3R/3R	0 (0)		N/A		N/A		N/A
	3R/4R	2 (4)		N/A		N/A		N/A
	3R/7R	0 (0)		N/A		N/A		N/A
	3R/8R	1 (2)		N/A		N/A		N/A
	4R/4R	28 (56)		N/A		N/A		N/A
	4R/5R	2 (4)		N/A		N/A		N/A
	4R/7R	2 (2)		N/A		N/A		N/A
	4R/8R	3 (6)		N/A		N/A		N/A
	5R/7R	0 (0)		N/A		N/A		N/A
	6R/7R	1 (2)		N/A		N/A		N/A
	7R/7R	1 (2)		N/A		N/A		N/A
	L/L	N/A		N/A		12 (24)		N/A
	L/S	N/A		N/A		24 (48)		N/A
	S/S	N/A		N/A		14 (28)		N/A
	9/9	N/A		N/A		N/A		5 (12)
	9/10	N/A		N/A		N/A		27 (42)
	10/10	N/A		N/A		N/A		18 (36)

^aDRD4: dopamine D4 receptor gene.

^bMAO-A: monoamine oxidase A.

^c5-HTTLPR: serotonin-transporter-linked polymorphic region.

^dDAT1: dopamine transporter 1.

^eN/A: not applicable.