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Research Letter
July 24/31, 2013

Incidence of Type 1 Diabetes in Finland

Author Affiliations
  • 1National Institute for Health and Welfare, Diabetes Prevention Unit, Helsinki, Finland
  • 2National Institute for Health and Welfare, Service Systems Research Unit, Helsinki, Finland
  • 3Children’s Hospital, University of Helsinki, Helsinki, Finland
  • 4Folkhälsan Institute of Genetics, Biomedicum Helsinki, Helsinki, Finland
JAMA. 2013;310(4):427-428. doi:10.1001/jama.2013.8399

The incidence of type 1 diabetes (T1D), one of the most prevalent chronic disease in children, has increased worldwide.1 The highest recorded incidence in children younger than 15 years was 64.2 per 100 000 person-years in Finland in 2005.2 We examined the incidence rates between 2006 and 2011 in Finnish children younger than 15 years as well as the 32-year trend (1980-2011).

All children with newly diagnosed T1D were ascertained using several nationwide registers as previously described.2 Age-standardized and age-specific annual incidence rates for age groups 0-4, 5-9, and 10-14 years were calculated.

Changes in trends between 1980 and 2011 were identified using the Joinpoint Regression Program version 4.0.1 (National Cancer Institute; http://surveillance.cancer.gov/joinpoint). The study was approved by the ethics committee of the National Institute for Health and Welfare, Finland, as a part of the FinDM II database studies. A waiver of informed consent is not required for register-based studies in Finland.