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Maternal age and risk of
type 1 diabetes
Title:Influence of maternal age at delivery and
birth order on risk of type 1 diabetes in childhood: prospective population based
family study
Author: P. Bingley, et al.
Address: Bristol,
England
Source:British Medical Journal 321: 420-424 (August) 2000
Summary: In a prospective population based family study, researchers
studied the impact of parental age at delivery and birth order on subsequent risk
of childhood diabetes. Subjects were 1375 families in which one child or more had
diabetes. Of 3221 offspring, 1431 had diabetes and 1790 remained non-diabetic at
a median age of 16.1 years. It was discovered that maternal age at delivery was
strongly related to the risk of type 1 diabetes in the offspring. The risk
increased by 25% for each five year increase of maternal age, so that maternal
age at delivery of greater than or equal to 45 years was associated with a relative risk of 3.11 when
compared with a maternal age of less than 20 years. Paternal age was also
associated with a 9% increase for each five year increase in paternal age.
However, the relative risk of diabetes, adjusted for parental age at delivery and
sex of offspring, decreased with increasing birth order. The overall effect was a
15% risk reduction per child born. Researchers speculated that the increase in
maternal age at delivery in the United Kingdom over the past two decades could
partly account for the rise in incidence of childhood diabetes over this period.
Comment: A curious association, but a mechanism is still lacking.