Abstract
Intrauterine factors have been implicated in the pathogenesis of Type 2 diabetes mellitus (T2DM). In a 1:1 matched pairs case-control study, high and low birthweight (HBW, LBW) rates in Saskatchewan Registered Indian (RI) diabetic cases were compared with corresponding rates in RI without diabetes, and non-RI people with and without diabetes. Birthweights were available for 73% of the 1,366 cases and 3 x 1,366 controls. A greater proportion of RI diabetics were born with HBW (> 4000 grams) compared to RI non-diabetics (16.2% vs 10.7%; p < 0.01). There was a significant association between HBW (but not LBW [< 2500 grams]) and diabetes for RI people (OR 1.63 [95% CI 1.20, 2.24]), which was stronger for RI females and strengthened progressively from mid to late 20th century. Certain causes of HBW may predispose to subsequent development of T2DM in Canadian Aboriginal people ("hefty fetal phenotype" ["hefty fetal type"] hypothesis). Programs that optimize healthy pregnancies could reduce T2DM incidence in future generations.
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