Type 1 diabetes accounts for about 5% to 10% of all patients with diabetes. It is the most commonly diagnosed diabetes of youth (under 20 years of age) and causes ≥85% of all diabetes cases in this age group worldwide. It is estimated that 1,110,100 people aged 0-19 years have type 1 diabetes worldwide, with 128,900 newly diagnosed cases each year.
In the US from 2014-2015, more than 18,000 people aged under 20 years were newly diagnosed with type 1 diabetes (annual rate for new cases about 21 in 100,000). Crude estimates in the US from 2018 estimated 1.4 million adults aged 20 years or older (5.2% of all US adults with diagnosed diabetes) reported both having type 1 diabetes and using insulin.
There is significant geographic variation in the incidence of type 1 diabetes. It is more common in European people and less common in Asian people, with age-adjusted incidence rates ranging from 0.1 per 100,000 per year in parts of China to 40.9 per 100,000 per year in Finland. Worldwide, the incidence of type 1 diabetes is increasing by 3% every year, although the reasons for this are unclear. One report showed a more rapid increase in nonwhite racial and ethnic groups.
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