Our overall analyses suggested that <i>MTRR</i> rs1801394, <i>MTRR</i> rs1532268, <i>MTHFR</i> rs1801131 and <i>MTHFR</i> rs1801133 polymorphisms were all significantly associated with the risk of CHD in certain genetic models.
A meta-analysis of polymorphism C677T (rs1801133) of the methylene tetrahydrofolate reductase (MTHFR) gene as a potential risk factor for congenital heart disease (CHD) in Chinese paediatric population was studied in view of the previously reported controversial results.