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Objectives: To identify demographic risk factors for either birthweight >4kg or over the 90th centile and to quantify the obstetric risks. Study design: Data from 350,311 completed singleton pregnancies in the North West Thames Region between 1988 and 1997 were analysed using logistic regression. Predisposing factors and pregnancy outcome were compared by birthweight 2.5-4kg (n=259,902) and >4kg...