title: Racial/ethnic differences in weekend delivery after induction of labor.
abstract: OBJECTIVE
  To determine whether the frequency induction of labor (IOL) varies by day of the week based on maternal race/ethnicity.
  
  
  METHODS
  Gravid women in the US from 2007 to 2010 were stratified into <34, 34 to 36, 37 to 38 and ⩾39 weeks. Multivariable analyses estimated the association between weekend delivery, race/ethnicity (categorized as non-Hispanic white, Hispanic white, black and 'other') and their interaction with induction.
  
  
  RESULTS
  After 34 weeks, induction was less likely on the weekend (P<0.01) and less likely in black, Hispanic or 'other' women relative to non-Hispanic whites (P<0.01). However, there was a significant positive interaction between race/ethnicity and weekend delivery (P<0.001). During the late preterm gestation, weekend IOL was greater in black women (odds ratio, 1.08).
  
  
  CONCLUSIONS
  The difference in IOL by race/ethnicity increased with gestational age. This difference was least on the weekends.
authors.affiliation: Division of Neonatology, Department of Pediatrics, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA.|Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
authors.forename: G H
authors.initials: GH
authors.lastname: Falciglia
authors.affiliation: Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.|Division of Maternal-Fetal Medicine, Department of Obstetrics & Gynecology, Prentice Women's Hospital, Chicago, IL, USA.
authors.forename: W A
authors.initials: WA
authors.lastname: Grobman
authors.affiliation: Division of Neonatology, Department of Pediatrics, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA.|Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
authors.forename: K
authors.initials: K
authors.lastname: Murthy
mesh_terms: D000293:Adolescent; D000328:Adult; D001741:Black or African American; D016208:Databases, Factual; D005006:Ethnicity; D005260:Female; D005865:Gestational Age; D006630:Hispanic or Latino; D006801:Humans; D007751:Labor, Induced / Q000706:statistics & numerical data*; D016015:Logistic Models; D008875:Middle Aged; D015999:Multivariate Analysis; D016017:Odds Ratio; D011247:Pregnancy; D013997:Time Factors; D014481:United States; D044465:White People; D055815:Young Adult