title: The association between interdelivery interval and adverse perinatal outcomes in a diverse US population.
abstract: The objective of this study was to investigate the association between interdelivery interval (IDI) and subsequent perinatal outcomes in a large population-based cohort.
  
  
  
  Retrospective cohort study of primiparous women with singleton gestations giving birth in the US in 2011 to 2012. IDI was defined as the time between last live birth and index live birth. IDI was categorized as 4 to 17 months, 18 to 36 months (referent), 37 to 60 months and >60 months. Statistical comparisons were made using chi-square tests and multivariable logistic regression models to control for confounding. Covariates included maternal age, prior preterm birth, prior cesarean and medical comorbidities.
  
  
  
  Of the 1 964 523 women meeting study criteria, 9.0% had an IDI of 4 to 17 months, 39.7% 18 to 36 months, 26.8% 37 to 60 months and 24.5% >60 months. Short IDI was associated with preterm delivery (<37 weeks; 13.8 vs 8.8%, (adjusted odds ratio (aOR) 1.51, 95% confidence interval (CI) 1.48 to 1.53)) and adverse perinatal outcomes including low 5-min Apgar, small for gestational age (SGA) status and neonatal intensive care unit (NICU) admission. Women with long IDI had a higher risk of induction of labor, cesarean delivery, chorioamnionitis, maternal ICU admission, preterm delivery and SGA status, 5-min Apgar score <4, and NICU admission.
  
  
  
  Compared with women with 18 to 36 month IDIs, women with either shorter or very long IDIs were at an increased risk of adverse maternal and neonatal outcomes.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
authors.forename: L M
authors.initials: LM
authors.lastname: Yee
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of California, Davis, School of Medicine, Sacramento, CA, USA.
authors.forename: Y N
authors.initials: YN
authors.lastname: Truong
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, OR, USA.
authors.forename: A B
authors.initials: AB
authors.lastname: Caughey
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of California, Davis, School of Medicine, Sacramento, CA, USA.
authors.forename: Y W
authors.initials: YW
authors.lastname: Cheng
mesh_terms: D000328:Adult; D001034:Apgar Score; D001721:Birth Intervals / Q000706:statistics & numerical data*; D002585:Cesarean Section / Q000706:statistics & numerical data*; D015986:Confounding Factors, Epidemiologic; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D016015:Logistic Models; D008297:Male; D008423:Maternal Age; D015999:Multivariate Analysis; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000453:epidemiology*; D047928:Premature Birth / Q000453:epidemiology*; D012042:Registries; D012189:Retrospective Studies; D014481:United States / Q000453:epidemiology; D055815:Young Adult