title: Correlates of the trend of cesarean section rates in twin pregnancies.
abstract: OBJECTIVE
  To examine the population-based trend for cesarean births in twin pregnancies for the last 13 years in Slovenia, and to find correlates for this trend.
  
  
  METHODS
  We evaluated data from the Slovenian national perinatal information system (NPIS) of all twin pairs born at ≥24 weeks during the period 1997-2009 (n=3916 pairs).
  
  
  RESULTS
  We noted a significant and steady increase of about 1.1% cesarean births/year, concomitant with significant increased birth rates at 34-36 weeks, but with a significant decrease over time in neonatal mortality. These trends were neither associated with any particular maternal characteristic nor with increased neonatal morbidity.
  
  
  CONCLUSIONS
  An association exists between an increased cesarean birth rate, increased preterm births at 33-36 weeks and concomitant significantly reduced neonatal mortality in twins.
authors.affiliation: Department of Perinatology, Division of Obstetrics and Gynecology, University Medical Centre Ljubljana, Slovenia.
authors.forename: Nataša
authors.initials: N
authors.lastname: Tul
authors.forename: Ivan
authors.initials: I
authors.lastname: Verdenik
authors.forename: Andreja
authors.initials: A
authors.lastname: Trojner-Bregar
authors.forename: Živa
authors.initials: Ž
authors.lastname: Novak
authors.forename: Isaac
authors.initials: I
authors.lastname: Blickstein
mesh_terms: D000328:Adult; D002585:Cesarean Section / Q000706:statistics & numerical data / Q000639:trends*; D005260:Female; D006801:Humans; D007226:Infant Mortality / Q000639:trends; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D011247:Pregnancy; D011256:Pregnancy Outcome; D059285:Pregnancy, Twin / Q000706:statistics & numerical data*; D047928:Premature Birth / Q000453:epidemiology; D017524:Slovenia / Q000453:epidemiology; D014427:Twins / Q000706:statistics & numerical data