Factors associated with nonanomalous stillbirths: the Utah Stillbirth Database 1992-2002.
OBJECTIVE
This study was undertaken to characterize risk factors associated with nonanomalous stillborn (SB) infants and to ascribe the probability of fetal survival by gestational age among high-risk pregnancies.


METHODS
We compiled a database of all SB infants and an equivalent number of controls using information obtained from Utah Birth and Fetal Death Certificates during the years 1992 through 2002. Adjusted and unadjusted odds ratios for risk factors associated with SB were generated. Cox proportional hazard models were used to generate survival curves comparing pregnancies complicated by chronic hypertension or gestational hypertension with those of controls.


RESULTS
Infants with major anomalies were eliminated from both cases and controls, to generate 1566 nonanomalous SBs and 2720 nonanomalous controls. In a logistic regression model controlling for multiple maternal and fetal factors, placental abruption, hydramnios, cord prolapse, and essential hypertension were associated with an increased risk of SB. In pregnancies complicated by essential hypertension, the survival curve diverged from that of controls at those gestational ages approaching term (hazard ratio 2.24; 95% CI 1.52-3.32).


CONCLUSIONS
SB in nonanomalous infants in Utah is more common among pregnancies complicated by placental abruption, hydramnios, cord prolapse, and essential hypertension.
Aagaard-Tillery
Kjersti M
KM
Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Utah Health Sciences, Salt Lake City, UT, USA. kjersti131@prodigy.net
Holmgren
Calla
C
Lacoursiere
D Yvette
DY
Houssain
Shaheen
S
Bloebaum
Lois
L
Satterfield
Robert
R
Branch
D Ware
DW
Varner
Michael W
MW
D016208:Databases, Factual; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology; D012307:Risk Factors; D050497:Stillbirth / Q000453:epidemiology*; D015996:Survival Rate; D014589:Utah