Polymorphism of MTHFR C677T Gene and the Associations with the Severity of Essential Hypertension in Northern Chinese Population

Table 3

Distribution of methylenetetrahydrofolate reductase 677T genotypes based on Hcy levels.

Hcy (µmol/L)	N	Genotype frequency (n) (%)^a			χ^2	value
		CC	CT	TT
5–10	179	46 (25.70)	106 (59.22)	27 (15.08)	99.81	<0.001
10–15	409	90 (22.00)	237 (57.95)	82 (20.05)
≥15	397	57 (14.36)	149 (37.53)	191 (48.11)

^aχ²_trend = 64.77, . Hcy: homocysteine.