US MTHFR MTHFR MTHFR MTHFR MTHFR MTHFR χ2 MCp
Normal Normal Heterozygous Heterozygous Homozygous Homozygous
No. % No. % No. %
7w-8w 0 0.0 0 0.0 0 0.0
8w-9w 1 2.5 3 7.5 1 2.5 2.076 0.340
9w-10w 4 10.0 3 7.5 2 5.0 0.733 0.777
10w-11w 2 5.0 2 5.0 0 0.0 0.639 1.000
11w-12w 5 12.5 4 10.0 2 5.0 0.340 1.000
12w-13w 4 10.0 2 5.0 0 0.0 1.176 0.602
13w-14w 3 7.5 1 2.5 1 2.5 1.037 0.679
Total 19 47.5 15 37.5 6 15.0