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Homocysteine levels and MTHFR gene mutations of patients.
| Normal | High | Total | P and X2 | |
| Control | 47 (77%) | 14 (33%) | 61 (100%) | P < 0.05X2 = 58.81 |
| MTHFR heterozygous | 73 (26.5%) | 202 (73.5%) | 275 (100%) | |
| MTHFR homozygous | 13 (20.9%) | 39 (79.1%) | 52 (100%) | |
| Total | 133 (34.3%) | 255(65.7%) | 388 (100%) |
