title: Neonatal mortality in weekend vs weekday births.
abstract: BACKGROUND
  Increases in neonatal mortality for infants born on the weekend were last noted several decades ago. Although the current health care environment has raised concern about the adequacy of weekend care, there have been no contemporary evaluations of daily patterns of births, obstetric intervention, and case mix-adjusted neonatal mortality.
  
  
  OBJECTIVE
  To compare the neonatal mortality of infants born on weekdays and weekends.
  
  
  METHODS
  Case series of 1 615 041 live births (weight >or=500 g) in California between 1995-1997 to determine patterns of births, cesarean deliveries, and neonatal deaths. Analyses were stratified by birth weight and delivery method. To assess the role of weekend differences in case mix, observed and birth weight-adjusted odds ratios (ORs) for increased weekend mortality were estimated using logistic regression.
  
  
  METHODS
  Birth weight-adjusted neonatal mortality.
  
  
  RESULTS
  There was a 17.5% decrease in births on weekends, accompanied by a decrease in the proportion of cesarean deliveries from 22% on weekdays to 16% on weekends. Weekend decreases in births were least pronounced in smaller infants, resulting in a weekend concentration of high-mortality, very low-birth-weight (<1500 g) births. Observed neonatal mortality increased from 2.80 per 1000 weekday births to 3.12 per 1000 weekend births (OR, 1.12; 95% confidence interval [CI], 1.05-1.19; P =.001) for all births, and from 4.94 to 6.85 (OR, 1.39; 95% CI, 1.25-1.55; P<.001) for cesarean deliveries. After adjusting for birth weight, the increased odds of death for infants born on the weekend were no longer significant.
  
  
  CONCLUSIONS
  The provision of optimal care regardless of the day of week is an important goal for perinatal medicine. Comparing the neonatal mortality of infants born on weekdays and weekends provides a straightforward assessment of this goal. After controlling for birth weight, we found no evidence that the quality of perinatal care in California was compromised during the weekend.
authors.affiliation: School of Public Health, University of California, Berkeley, USA. jbgould@stanford.edu
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Gould
authors.forename: Cheng
authors.initials: C
authors.lastname: Qin
authors.forename: Amy R
authors.initials: AR
authors.lastname: Marks
authors.forename: Gilberto
authors.initials: G
authors.lastname: Chavez
mesh_terms: D001724:Birth Weight; D002140:California; D002585:Cesarean Section; D036861:Delivery, Obstetric / Q000706:statistics & numerical data; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D016015:Logistic Models; D010043:Outcome and Process Assessment, Health Care