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Diabet Med. 1990 Dec;7(10):876-9.

Familial aggregation in type 1 (insulin-dependent) diabetes mellitus: a study from south India.

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Diabetes Research Centre, Royapuram, Madras, India.


An analysis of 617 Type 1 (insulin-dependent) diabetic patients from 587 families was made. In 33 families (5.6%) there was more than one Type 1 diabetic patient. In 98 families (16.7%) positive family history of Type 2 (non-insulin-dependent) diabetes was present. There was a linear correlation between the age at diagnosis of the proband and that of the sibling (r = 0.73, p less than 0.001) in the Type 1 multiplex families. The risk of Type 1 diabetes in relatives was found to be 2.7% by Li Mantel estimate, which is lower than that reported among Europeans. The cumulative risk was higher (p less than 0.001) in the relatives of Type 1 diabetic patients with age at diagnosis less than or equal to 10 years.

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