Table 1.

Distribution of the MTHFR C677T genotype and allele frequencies among pregnant women in Yunnan.

				Allele frequency
Single nucleotide polymorphism	Total sample size	Observed genotypic	Count (n%)	C	T	P∗
MTHFR C677T	3387	CC	1350 (39.9)	0.63	0.37	.96
		CT	1540 (45.4)
		TT	497 (14.7)