MTHFR and metabolic syndrome: The MTHFR C677T polymorphism was associated with an increased risk of MetS under the homozygous codominant model (odds ratio (OR) = 1.46, 95% confidence interval (CI) = 1.10–1.94, p = 0.0097), dominant model (OR = 1.30, 95% CI = 1.02–1.67, p = 0.0355), recessive model (OR = 1.27, 95% CI = 1.02–1.58, p = 0.0306) and allelic model (OR = 1.21, 95% CI = 1.05–1.39, p = 0.0086) (Table 2).