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Geographical variation in the incidence of type 1 diabetes in the Nordic countries: A study within NordicDiabKids
Department of Clinical and Experimental Medicine, Division of Paediatrics and Diabetes, Research Centre, Linköping University, Linköping, Sweden.
IFM Biology, Linköping University, Linköping, Sweden.
Jönköping University, School of Health and Welfare, The Jönköping Academy for Improvement of Health and Welfare. Department of Pediatrics, County Hospital Ryhov, Jönköping, Sweden.
Department of Pediatrics, Aarhus University Hospital, Aarhus, Denmark.
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2019 (English)In: Pediatric Diabetes, ISSN 1399-543X, E-ISSN 1399-5448Article in journal (Refereed) Epub ahead of print
Abstract [en]

Background: The incidence of type 1 diabetes (T1D) is high in the Nordic countries with geographic differences between as well as within countries. Objective: To describe the geographical distribution of the incidence of T1D among children in four Nordic countries, an area where the population is considered genetically similar. Methods: Data on children 0 to 14 years of age and diagnosed with T1D 2006 to 2011 was collected from four Nordic national pediatric quality diabetes registries. Data included year of diagnosis (2006-2011), sex, and age at diagnosis. Figures for number of children at risk during 2006 to 2011—as well as total population, proportion with foreign background and size of populated areas of geographic regions—were collected from official statistics. Results: The total incidence during the study period for all four countries was 35.7/100 000 person years but differed between the countries (range 18.2-44.1; P <.001). The incidence difference between the countries was most obvious in the highest age group, 10 to 14 years of age, whereas there was no difference in the youngest age group 0 to 5 years of age. Iceland had similar incidence in the entire country, whereas the other countries had areas with different incidence. Densely populated areas, such as major cities, had the lowest incidence. Conclusion: The incidence of T1D differed between the Nordic countries and also between the neighboring countries and generally decreased with population density. This indicates that environmental factors may contribute to the level of incidence of T1D.

Place, publisher, year, edition, pages
Blackwell Publishing, 2019.
Keywords [en]
children, environmental factors, geographical variation, incidence, type 1 diabetes
National Category
Pediatrics
Identifiers
URN: urn:nbn:se:hj:diva-46984DOI: 10.1111/pedi.12943ISI: 000496734700001PubMedID: 31702838Scopus ID: 2-s2.0-85075396346Local ID: ;HHJÖvrigtISOAI: oai:DiVA.org:hj-46984DiVA, id: diva2:1375646
Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2019-12-05

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