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Original Article Thyroid Dysfunction in Chinese Children with Down Syndrome Abstract Thyroid dysfunction, especially primary hypothyroidism, is common among patients with Down Syndrome. The clinical features of hypothyroidism cannot be easily distinguished from those of Down syndrome and a screening programme is necessary for early detection. This study showed that the prevalence of primary hypothyroidism was 33% among boys and 31% in girls while the prevalences of thyrotoxicosis and Hashimoto thyroiditis was each at 1.3%. Keyword : Chinese; Congenital hypothyroidism; Down syndrome; Primary hypothyroidism |