Abstract:Introduction International studies on this topic yield controversial results. No studies from Russia have been published. We contribute by studying associations between maternal pre-pregnant BMI and the risk of spontaneous preterm birth in Northwest Russia. Methods A historical cohort study using the data of the Murmansk County Birth Registry. All spontaneous singleton births in the county in 2006e2008 were included (n¼23 527). All women were categorised as underweight (<18.5 kg/m 2 ), normal (18.5e24.9 kg/ m … Show more
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