Table 3.

Genotype and allele frequencies of the studied gene variants.

Gene	SNP	Variant	Allele	frequency	χ2	P
SLC22A1	rs622342	A/C	A	82.4%	0.37	.54
			C	17.6%
SLC22A2	rs316019	G/T	G	88.4%	0.67	.41
			T	11.6%
SLC47A1	rs2289669	G/A	G	54.8%	0.33	.57
			A	45.2%
SLC47A1	rs2252281	T/C	T	75.2%	0.23	.63
			C	24.8%