title: Snoring during pregnancy and delivery outcomes: a cohort study.
abstract: OBJECTIVE
  This cohort study examined the impact of maternal snoring on key delivery outcomes such as mode of delivery, infant birth centile, and small-for-gestational age.
  
  
  METHODS
  Cohort study.
  
  
  METHODS
  A large tertiary medical center.
  
  
  METHODS
  Pregnant women in their third trimester were recruited between March 2007 and December 2010.
  
  
  RESULTS
  Women were screened for habitual snoring, as a known marker for sleep disordered breathing. Outcome data were obtained from medical records following delivery and birth centiles were calculated. Of 1,673 women, a total of 35% reported habitual snoring (26% with pregnancy-onset snoring and 9% with chronic snoring). After adjusting for confounders, chronic snoring was associated with small-forgestational age (OR 1.65, 95%CI 1.02-2.66, P = 0.041) and elective cesarean delivery (OR 2.25, 95%CI 1.22-4.18, P = 0.008). Pregnancy-onset snoring was associated with emergency cesarean delivery (OR 1.68, 95%CI 1.22-2.30, P = 0.001).
  
  
  CONCLUSIONS
  Maternal snoring during pregnancy is a risk factor for adverse delivery outcomes including cesarean delivery and small-for-gestational age. Screening pregnant women for symptoms of SDB may provide an early opportunity to identify women at risk of poor delivery outcomes.
  
  
  BACKGROUND
  IDENTIFIER: NCT01030003.
authors.affiliation: Sleep Disorders Center, Department of Neurology ; Department of Oral and Maxillofacial Surgery ; Department of Obstetrics and Gynecology.
authors.forename: Louise M
authors.initials: LM
authors.lastname: O'Brien
authors.forename: Alexandra S
authors.initials: AS
authors.lastname: Bullough
authors.forename: Jocelynn T
authors.initials: JT
authors.lastname: Owusu
authors.forename: Kimberley A
authors.initials: KA
authors.lastname: Tremblay
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Brincat
authors.forename: Mark C
authors.initials: MC
authors.lastname: Chames
authors.forename: John D
authors.initials: JD
authors.lastname: Kalbfleisch
authors.forename: Ronald D
authors.initials: RD
authors.lastname: Chervin
mesh_terms: D000328:Adult; D001724:Birth Weight; D002585:Cesarean Section / Q000706:statistics & numerical data; D015331:Cohort Studies; D036861:Delivery, Obstetric / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology*; D011256:Pregnancy Outcome / Q000453:epidemiology*; D012307:Risk Factors; D012913:Snoring / Q000150:complications*
keywords: Sleep disordered breathing; cesarean delivery; cord blood; small for gestational age