Increased prevalence of Down's syndrome in individuals with type 1 diabetes in Denmark: A nationwide population-based study.
OBJECTIVE
In patients with Down's syndrome, dogma has long held that the prevalence of diabetes is increased. The aim of the present study was to determine the actual prevalence of Down's syndrome among type 1 diabetic patients.


METHODS
The background population included all children born in Denmark between 1981 and 2000. Registry-validated and clinical data on type 1 diabetes and Down's syndrome diagnoses were obtained from the National Disease Register and Danish Cytogenetic Central Register, respectively.


RESULTS
The prevalence of Down's syndrome in the background population was 0.09%, whereas we identified a prevalence of Down's syndrome in type 1 diabetes patients of 0.38% (95% CI 0.17-0.75), corresponding to a 4.2-fold increased prevalence compared with the background population (p = 7.3 x 10(-5)).


CONCLUSIONS
To the best of our knowledge this is the first population-based study addressing the prevalence of Down's syndrome among verified type 1 diabetes patients. A more than fourfold increased prevalence of Down's syndrome among type 1 diabetes patients supports the notion that genes on chromosome 21 may confer risk for type 1 diabetes, probably also in the general population.
Steno Diabetes Center, 2, Niels Steensensvej, 2820, Gentofte Denmark. rber@steno.dk
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Bergholdt
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Eising
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Nerup
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Pociot
D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D001323:Autoantibodies / Q000097:blood; D002648:Child; D003718:Denmark / Q000453:epidemiology; D003922:Diabetes Mellitus, Type 1 / Q000150:complications / Q000453:epidemiology*; D004314:Down Syndrome / Q000150:complications / Q000453:epidemiology*; D006801:Humans; D007004:Hypoglycemic Agents / Q000627:therapeutic use; D007223:Infant; D007328:Insulin / Q000627:therapeutic use; D015995:Prevalence; D012042:Registries
D001323:Autoantibodies; D007004:Hypoglycemic Agents; D007328:Insulin