Table 4. Hardy-Weinberg distribution for MTHFR 1298 genotypes in control population.

	Allele X	Allele Y	Observed frequency	%	HW expected frequency	%	Chi2	P value
AA	740	0	370	53.62	394	57.12	1.479
AC	303	303	303	43.91	255	36.91	9.158
CC	0	34	17	2.46	41	5.96	14.172
Total	1043	337	690	100.00	690	100.00	24.809	0.00000063*