Table 2.

Hardy–Weinberg law in studied SNPs in the groups

Gene	SNP	Migraine patients		Healthy controls
		χ2	P-value	χ2	P-value
BDNF	rs6265	0.078	0.779	0.001	0.994
	rs925946	0.062	0.803	0.497	0.481
	rs2049046	0.151	0.697	3.544	0.059
	rs12273363	1.071	0.301	0.237	0.626
NGF	rs6330	0.326	0.568	0.249	0.617
	rs11102930	0.921	0.337	0.143	0.704
	rs4839435	0.299	0.584	0.109	0.741

Abbreviations: χ², chi-square; SNP, single-nucleotide polymorphism.