The prevalence of thyroid disorders in the UK is thought to be between 0.5% and 2%, predominantly occurring in women. In adult women in the Netherlands the prevalence of thyrotoxicosis has been estimated at 0.8 cases per 1000 population; and in the Stockholm area of Sweden, the incidence of solitary toxic adenoma has been estimated at 3.3 cases per 100,000 people per year.[3][4] In the US, toxic adenomas are most common in younger adults (age 20 to 40 years) and account for about 5% of cases of hyperthyroidism.[5]

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