Adverse pregnancy outcomes: differences between US- and foreign-born women in major US racial and ethnic groups.
OBJECTIVE
This study examined whether there were significant differentials between US-born and foreign-born women in risks of infant mortality, low birthweight, and preterm birth and whether these differentials, if they existed, varied across major US racial/ethnic groups.


METHODS
Multivariate logistic regression was applied to national linked birth/infant death records for 1985 through 1987 to estimate overall and ethnic-specific maternal nativity effects on pregnancy outcomes.


RESULTS
Substantial maternal nativity differences in risks of infant mortality and low birthweight were found, with the magnitude of the nativity effect varying significantly across racial/ethnic groups. Overall, foreign-born status was associated with 7% and 20% lower risks of low birthweight and infant mortality, respectively. However, the reduced risk of adverse pregnancy outcome associated with immigrant status tended to be substantially larger for Blacks, Cubans, Mexicans, and Chinese than for other ethnic groups.


CONCLUSIONS
Maternal nativity status, along with ethnicity, may serve as an important axis of differentiation in birth outcome studies. Further research needs to be conducted to assess the effects of behavioral, cultural, and psychosocial factors in explaining the nativity differentials observed here.
Singh
G K
GK
Division of Vital Statistics, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, MD 20782, USA.
Yu
S M
SM
D001719:Birth Certificates; D003644:Death Certificates; D004641:Emigration and Immigration; D005006:Ethnicity; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D016015:Logistic Models; D011159:Population Surveillance; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000208:ethnology*; D044469:Racial Groups; D012111:Residence Characteristics; D012307:Risk Factors; D012907:Smoking / Q000208:ethnology; D012959:Socioeconomic Factors; D014481:United States / Q000453:epidemiology