Prepregnancy risk factors for antepartum stillbirth in the United States.
OBJECTIVE
To identify possible prepregnancy risk factors for antepartum stillbirth and to determine whether these factors identify women at higher risk for term stillbirth.


METHODS
This retrospective cohort study of prepregnancy risk factors compared 712 singleton antepartum stillbirths with 174,097 singleton live births at or after 23 weeks of gestation. The risk of term antepartum stillbirth then was assessed in a subset of 155,629 singleton pregnancies.


RESULTS
In adjusted multivariable analyses, African-American race, Hispanic ethnicity, maternal age 35 years or older, nulliparity, prepregnancy body mass index (BMI) 30 or higher, preexisting diabetes, chronic hypertension, smoking, and alcohol use were independently associated with stillbirth. Prior cesarean delivery and history of preterm birth were associated with increased stillbirth risk in multiparous women. The risk of a term stillbirth for women who were white, 25-29 years old, normal weight, multiparous, no chronic hypertension, and no preexisting diabetes was 0.8 per 1,000. Term stillbirth risk increased with the following conditions: preexisting diabetes (3.1 per 1,000), chronic hypertension (1.7 per 1,000), African-American race (1.8 per 1,000), maternal age 35 years or older (1.3 per 1,000), BMI 30 or higher (1 per 1,000), and nulliparity (0.9 per 1,000).


CONCLUSIONS
There are multiple independent risk factors for antepartum stillbirth. However, the value of individual risk factors of race, parity, advanced maternal age (35-39 years old), and BMI to predict term stillbirth is poor. Our results do not support routine antenatal surveillance for any of these risk factors when present in isolation.


METHODS
II.
Reddy
Uma M
UM
Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA. reddyu@mail.nih.gov
Laughon
S Katherine
SK
Sun
Liping
L
Troendle
James
J
Willinger
Marian
M
Zhang
Jun
J
D000328:Adult; D015992:Body Mass Index; D002585:Cesarean Section; D005260:Female; D006801:Humans; D007341:Insurance; D017533:Marital Status; D008423:Maternal Age; D010298:Parity; D011247:Pregnancy; D011248:Pregnancy Complications; D044469:Racial Groups; D012307:Risk Factors; D050497:Stillbirth; D047929:Term Birth; D014481:United States; D055815:Young Adult