African-Americans at Increased Risk for Earlier Preterm Births
Multiple pre-term births also more likely
New York, February 9, 2007 – Using data from over 700,000 births in Missouri from 1989 to 1997, researchers found that African American mothers were 3 times more likely than Caucasian mothers to deliver prematurely at 20-34 weeks and almost 4 times more likely to deliver extremely prematurely at 20-28 weeks. (Full term births occur at 37-41 weeks gestation.) The results of the study are published in the February issue of the American Journal of Obstetrics & Gynecology.
African American mothers were also more than 5 times more likely to have repeating premature births than Caucasian mothers. Although all mothers who had initially delivered a premature infant at 20-34 weeks of gestation were more likely to do so again, the rate for Caucasian women was 9.2% and the rate for African American women was 21.5%.
Writing in the article, Louis J. Muglia, MD PhD, from the Center for Preterm Birth Research at Washington University School of Medicine, states, "We find that African-American women experience preterm birth not only at increased rates as compared to Caucasian women, but also at earlier gestations and with increased repetition… [We] further analyze the pattern of recurrent preterm birth stratified by race and find that the tendency to repeat preterm birth during the same week occurs for both Caucasians and African Americans, but the median age for preterm birth is shifted two weeks earlier in African Americans. These findings together highlight the importance of race, particularly after correction for other risk factors, and suggest a probable genetic component that may underlie the public health problem presented by the racial disparity in preterm birth."
The study, "Racial Disparity in the Frequency of Recurrence of Preterm Birth" by Zachary A.-F. Kistka, Lisanne Palomar, Kirstin A. Lee, M.D., Sarah E. Boslaugh, Ph.D., Michael F. Wangler, M.D., F. Sessions Cole, M.D., Michael R. DeBaun, M.D., M.P.H., and Louis J. Muglia, M.D. Ph.D., appears in the February 2007 issue of the American Journal of Obstetrics & Gynecology, Volume 196, Issue 2 published by Elsevier.
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The American Journal of Obstetrics & Gynecology, known as "The Gray Journal", presents coverage of the entire spectrum of the field, from the newest diagnostic procedures to leading-edge research. The Journal provides comprehensive coverage of the specialty, including maternal-fetal medicine, reproductive endocrinology/infertility, and gynecologic oncology. It also publishes the annual meeting papers of several of its more than 30 sponsoring societies, including the Society for Maternal-Fetal Medicine and the Society of Gynecologic Surgeons. The American Journal of Obstetrics & Gynecology has the highest ranking for citation frequency of any ob/gyn journal and ranks in the top 1.7% of the 5,684 journals listed in the most recent Science Citation Index.
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