Non-anomalous stillbirth by gestational age: trends differ based on method of epidemiologic calculation.
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.
Heuser
Cara
C
Department of Obstetrics and Gynecology, University of Utah, 30 North 1900 East, Salt Lake City, UT 84132, USA. Cara.heuser@utah.edu
Manuck
Tracy
T
Hossain
Shaheen
S
Silver
Robert
R
Varner
Micheal
M
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