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Obesity Prior to Pregnancy Linked to Preterm Births

by Dr. Enozia Vakil on June 26, 2014 at 10:46 PM
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 Obesity Prior to Pregnancy Linked to Preterm Births

Women who are obese before they become pregnant may have an increased risk of delivering a premature baby, researchers have found.

The findings from the Stanford University School of Medicine provide important clues as to what triggers extremely preterm births, specifically those that occur prior to 28 weeks of pregnancy.

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The study found no link between maternal obesity and premature births that happen between 28 and 37 weeks of the normal 40-week gestation period.

Gary Shaw, DrPH, professor of pediatrics and lead author of the new study, said until now, people have been thinking about preterm birth as one condition, simply by defining it as any birth that happens at least three weeks early, adding that however, it's not as simple as that. Preterm birth is not one construct; gestational age matters.
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The study, which examined nearly all California births between January 2007 and December 2009, was the largest ever to look for population-based links between maternal obesity and prematurity.

To focus on spontaneous preterm births, the researchers excluded from analysis women who were pregnant with twins or other multiples, as well as women with illnesses previously linked to prematurity, such as diabetes, high blood pressure or preeclampsia. After these exclusions, the team had 989,697 births to analyze. Births were classified by gestational age, and many factors about the mothers were considered in the analysis, including body mass index, race/ethnicity, whether they were first-time mothers, educational attainment, when prenatal care began, source of health insurance, maternal age and maternal height.

For first-time mothers, obesity was linked with a substantial increase in risk of delivery before 28 weeks of pregnancy. The risk was highest at the earliest gestational ages and also at the highest levels of obesity.

Obese women having their second or later child were also more likely to deliver very early than normal-weight women, though the risk was less pronounced than for first-time mothers.

The study has been published in the journal Paediatric and Perinatal Epidemiology.

Source: ANI
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