Table 6. Genotypes of SNPs-related variation of dopamine concentration in DRD4

Genotype SNP
G292A C147T
GG (n = 8) GA (n = 20) AA (n = 3) CC (n = 28) CT (n = 3)
Dopamine (ng/mL) 8.1 ± 1.65b 10.1 ± 1.50b 4.8 ± 0.91a 9.1 ± 1.19 8.5 ± 1.32
Means with different superscript letters are significantly different (p < 0.05).
SNP, single nucleotide polymorphism; DRD4, dopamine receptor D4 gene.