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Adjusted survival analyses of total breastfeeding duration as assessed at 24 months post partum by pre-pregnancy BMI category, among (a) non-smoking mothers (n=2648) and (b) smoking mothers (n=939). Analyses controlled for maternal age, education, parity, history of diseases in pregnancy (diabetes and arterial hypertension), alcohol consumption, child's sex, gestational age, birth weight and type of delivery.
