title: Non-anomalous stillbirth by gestational age: trends differ based on method of epidemiologic calculation.
abstract: OBJECTIVE
  The objective of the study is to compare gestational age specific rates, risks and prospective risks of stillbirth.
  
  
  METHODS
  A retrospective cohort study of women with a singleton non-anomalous pregnancy was conducted. Definitions were chosen to maintain consistency with previous literature.
  
  
  RESULTS
  Rate was highest at 20 weeks, nadired at 41 weeks and rose thereafter. Risk was low earlier in gestation, nadired at 29 weeks and rose with increasing gestational age. Prospective risk was highest at 20 weeks, nadired at 40 weeks and rose at 42 weeks.
  
  
  CONCLUSIONS
  Differences in trends of stillbirth are noted depending on the calculation. All of these calculations are useful in clinical practice.
authors.affiliation: Department of Obstetrics and Gynecology, University of Utah, 30 North 1900 East, Salt Lake City, UT 84132, USA. Cara.heuser@utah.edu
authors.forename: Cara
authors.initials: C
authors.lastname: Heuser
authors.forename: Tracy
authors.initials: T
authors.lastname: Manuck
authors.forename: Shaheen
authors.initials: S
authors.lastname: Hossain
authors.forename: Robert
authors.initials: R
authors.lastname: Silver
authors.forename: Micheal
authors.initials: M
authors.lastname: Varner
mesh_terms: D015982:Bias; D015331:Cohort Studies; D000013:Congenital Abnormalities / Q000401:mortality; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D005865:Gestational Age; D006801:Humans; D007226:Infant Mortality / Q000639:trends*; D007231:Infant, Newborn; D015233:Models, Statistical; D011247:Pregnancy; D012189:Retrospective Studies; D050497:Stillbirth / Q000453:epidemiology*; D014589:Utah / Q000453:epidemiology