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Health & Pregnancy

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Preterm Birth Rates Heading in Right Direction, Barely

March of Dimes Report Shows Decline in Nation's Preterm Birth Rate
By Rita Rubin
WebMD Health News
Reviewed by Laura J. Martin, MD

Nov. 1, 2011 -- Preterm birth rates improved in nearly every state between 2006 and 2009, but the United States still merited only a "C" on the March of Dimes' latest Premature Birth Report Card.

The U.S. rate rose to a peak of 12.8% in 2006. It declined to 12.3% in 2008 and, according to preliminary data, to 12.2% in 2009.

Back in 1981, the preterm birth rate was 9.4%.

Jennifer Howse, PhD, president of the March of Dimes, attributes the climb over time to such factors as the growing problem of obesity, which increases the risk of gestational diabetes and high blood pressure; increasing numbers of uninsured women; and the rising rate of elective C-sections, some of which may be scheduled too early.

"There have been a lot of trends that have gone in the wrong direction in terms of women's health status," Howse says.

But two went in the right direction between 2008 and 2009, according to the March of Dimes. The percentage of women who smoked, a risk factor for premature delivery, fell from 19.6% to 17.6%, while the percentage of late preterm births, those between 34 and 36 weeks' gestation, inched down from 8.8% to 8.7%.

Births before 37 weeks gestation cost the U.S. more than $26 billion annually, according to a 2006 Institute of Medicine report. It is the leading cause of newborn death, and those who survive often face the risk of lifelong health problems.

The March of Dimes had set a national goal of a 7.6% preterm birth rate by 2010. In this year's report though, the organization announced it had raised the goal for 2020 to a more realistic 9.6%.

"It takes us down 20% from where we are today," Howse says, "but it's a doable goal."

Best and Worst States

With a 9.3% preterm birth rate in 2009, Vermont is the only state to have already reached that 2020 national goal and earn an "A" grade from the March of Dimes.

Mississippi, Alabama, Louisiana, the District of Columbia, and Puerto Rico had the highest preterm birth rates and earned Fs.

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