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Study Looks at Racial, Ethnic Differences in Gestation, Mortality Risk
An article published in this month's issue of Obstetrics and Gynecology examines trends over the past decade for maternal racial and ethnic differences in neonatal, postneonatal, and infant mortality for early-term births compared with full-term births. The authors also explore the causes of neonatal and postneonatal mortality for early-term and full-term births by maternal race and ethnicity.
The researchers analyzed National Center for Health Statistics' U.S. period-linked birth and infant death data for 1995-2006. The analysis was limited to singleton live births between 37 and 41 completed weeks of gestation.
The authors found that
· Early-term births (at 37 and 38 weeks of gestation) were consistently associated with significantly higher neonatal and infant mortality rates when compared with births at 39 through 41 weeks of gestation over time.
· Infant mortality for births at 37 through 41 completed weeks of gestation has decreased in the past decade across all race and ethnicities.
· The non-Hispanic black infant mortality rate has experienced the smallest decrease at 37 weeks of gestation when compared with improvements for non-Hispanic whites and Hispanics. This is because the neonatal mortality rate for non-Hispanic blacks at 37 weeks of gestation has not sustained any improvement with an increase of 15.8 percent over the past decade. Declines in mortality for infants born at 38 weeks of gestation were also less for non-Hispanic blacks compared with the other groups.
· In 2006, compared with whites, non-Hispanic black infants were 40 percent more likely to die in the neonatal period and 80 percent more likely to die in the postneonatal period if they were born at either early term or full term.
· Accidents, assault, and sudden infant death syndrome were major contributors to the black and white disparity in postneonatal mortality.
"Because 40 weeks of gestation has the lowest infant mortality rates across all race and ethnicities, it should be regarded as the optimal gestational age to use as a control group rather than analyzing infants born over the entire term period," the authors conclude. They add, "although there have been improvements in overall neonatal, postneonatal, and infant mortality rates across the term period in the past decade, the unacceptable disparity in infant mortality remains for non-Hispanic blacks and must be targeted by intervention to decrease the mortality rate for this high-risk group."
An abstract of the article is available here.
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