Background: Cognitive impairment is commonly observed in patients with Hashimoto thyroiditis (HT). Low levels\nof vitamin D have been correlated with cognitive impairment in non-HT population. We examined the association\nof vitamin D levels with cognitive impairment in patients with HT.\nMethods: We recruited 194 patients with HT and 200 healthy volunteers. Levels of serum 25-hydroxyvitamin D\n(25(OH)D) were measured using a competitive protein-binding assay. Cognitive funtion was assessed using\nMontreal Cognitive Assessment score (MoCA). Subjects with a MoCA scores < 26 are considered as having mild\ncognitive impairment (MCI). Multivariate analysis was performed using logistic regression models.\nResults: Fifty-five HT patients (28.4%) were diagnosed as having MCI. Patients with MCI had significantly lower\n25(OH)D levels when compared with patients without MCI (33.9............
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