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Pregnant women's likelihood of cesarean delivery in Massachusetts linked to choice of hospitals
Date:3/18/2013

Boston, MA There is wide variation in the rate of cesarean sections performed at different hospitals across the U.S. and one explanation has been that hospitals with higher c-section rates serve greater numbers of women at high risk for the procedure. Now, a new study by researchers from Harvard School of Public Health (HSPH) and the Massachusetts Department of Public Health provides the strongest evidence to date that it's not just medical need that determines who has c-sections, but also something at the hospital levelin other words, the same woman would have a different chance of undergoing a c-section based on the hospital she chooses.

The findings suggest that certain hospitals' high rates of cesarean births have more to do with characteristics of the hospitals themselves than with characteristics of their patients.

"Even after taking into account factors that put women at risk of having a c-section, such as age, and pre-existing health conditions, some hospitals still have higher rates of c-section delivery than others," said senior author S V Subramanian, professor of population health and geography at HSPH. Put simply, for two women with a similar observed risk profile, one might have a c-section delivery and one might not, depending on which hospital they go to, he said.

The study appears in the March 18, 2013 online issue of the journal PLOS ONE. The article will be available after the embargo lifts at this link: http://dx.plos.org/10.1371/journal.pone.0057817.

While c-sections can be a lifesaving procedure for an infant in distress, or when there are multiple births or other labor complications, c-sections that are not medically necessary can put mothers and babies at avoidable risk of infection, extend hospital stays and recoveries, and increase health costs. In spite of these risks, c-section rates have been increasing in the U.S. over the past 17 years. Mirroring the national trend, cesarean deliveries in Massachusetts have increased steadily since 1997. In 2009, about one-third of all births in Massachusetts were by c-sectionup 61% from 1998.

In 2008, the Massachusetts Department of Public Health invited local clinicians and researchers to partner with state health officials in a study to better understand why c-section rates have been rising in Massachusetts. The HSPH, Boston University, Massachusetts General Hospital, and Massachusetts Department of Public Health team, using data from the Pregnancy to Early Life Longitudinal data system, analyzed 228,864 births in Massachusetts' 49 hospitals with maternity services from 2004-200698% of all births during that period.

The researchers found that about 27% of first-time mothers in Massachusetts having single, vertex (head-first) presentation, full-term infants from 2004-2006 had c-sections. C-section rates in Massachusetts hospitals varied from 14% to 38% even among this low-risk group.

Previous research had been unable to offer clear answers on whether variations in hospitals' c-section rates had simply to do with hospitals' different case mix. But the new research findings, say the authors, show with more certainty that a mother's risk of c-section really is influenced by her choice of hospital. "This is the first time that anyone has shown this problem exists right here in Massachusetts, which is widely considered to be one of the world's premier health care hubs," said Mariana Arcaya, research scientist at the Harvard Center for Population and Development Studies and co-author of the study.

The findings suggest that hospital practices and culture are important determinants of a hospital's c-section rate, said lead author Isabel A. Cceres, who was an epidemiologist at the Massachusetts Department of Public Health at the time of the study. Though this study did not pinpoint which hospital factors were at play, the authors highlighted previous studies suggesting that liability and insurance, being a teaching hospital, hospital admission practices, and the presence of midwives may influence c-section rates. Lack of clinical guidelines or standards on when a cesarean should be performed also may help explain why hospital rates are so variable.

The researchers said that hospitals should re-examine their procedures for deciding when to perform c-sections to make sure that medical neednot other factors such as doctor preferences or fear of liabilitydetermine how babies are delivered.


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Contact: Marge Dwyer
mhdwyer@hsph.harvard.edu
617-432-8416
Harvard School of Public Health
Source:Eurekalert

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