title: Maternal dietary nutrient intake and risk of preterm delivery.
abstract: OBJECTIVE
  To examine maternal dietary intake and preterm delivery.
  
  
  METHODS
  Data included 5738 deliveries from the National Birth Defects Prevention Study. Odds ratios (ORs) reflected risks of delivery at <32, 32-34, or 35-36 versus ≥ 37 weeks for maternal intake in the lowest or highest quartile of nutrient intake compared with the middle two.
  
  
  RESULTS
  Among deliveries < 32 weeks, many ORs were ≥ 1.5 or ≤ 0.7, but few confidence intervals excluded one. ORs were ≥ 1.5 for lowest quartiles of protein, thiamin, riboflavin, choline, vitamin A, α-carotene, β-carotene, vitamin E, iron, copper, and zinc and for highest quartiles of carbohydrate, glycemic index, and Mediterranean Diet Score. ORs were ≤ 0.7 for lowest quartiles of glycemic index and betaine and for highest quartiles of protein, alanine, methionine, vitamin B6, betaine, and calcium. Few ORs met these criteria for later preterm deliveries.
  
  
  CONCLUSIONS
  Results suggested an association of nutrient intake with earlier preterm deliveries.
authors.affiliation: Division of Neonatology and Developmental Medicine, Stanford University School of Medicine, Stanford, California 94305, USA. scarmichael@stanford.edu
authors.forename: Suzan L
authors.initials: SL
authors.lastname: Carmichael
authors.forename: Wei
authors.initials: W
authors.lastname: Yang
authors.forename: Gary M
authors.initials: GM
authors.lastname: Shaw
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D016001:Confidence Intervals; D004032:Diet; D004034:Diet Surveys; D004044:Dietary Proteins; D005260:Female; D006801:Humans; D016017:Odds Ratio; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology*; D012307:Risk Factors; D014481:United States / Q000453:epidemiology; D014815:Vitamins; D055815:Young Adult
chemical_list: D004044:Dietary Proteins; D014815:Vitamins