Any intake of seafood above no/rare intake (>5 g/d) was associated with lower prevalence of preterm delivery. Lean fish constituted 56%, fatty fish 34% and shellfish 10% of seafood intake. Preterm was defined as any onset of delivery before gestational week 37, and as spontaneous or iatrogenic deliveries and as preterm delivery at early, moderate, and late preterm gestations. We used Cox regression to estimate hazard ratios (HR) with 95% confidence intervals (CI) for associations between total seafood, lean fish, fatty fish, and LCn-3PUFA intakes and preterm delivery. Information about gestational duration was obtained from the Medical Birth Registry of Norway. Maternal food and supplement intakes were assessed by a validated self-reported food frequency questionnaire in mid-pregnancy. The study population included 67,007 women from the Norwegian Mother and Child Cohort Study. The aim of this study was to assess whether maternal intakes of seafood and marine long chain n-3 polyunsaturated fatty acids (LCn-3PUFA) from supplements were associated with preterm delivery. Studies suggest that maternal diet may affect the prevalence of preterm delivery. Preterm delivery increases the risk of neonatal morbidity and mortality.
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