The stress of divorce seems to take a higher toll on a woman's health than it does on the health of a man.

A divorced woman is more likely to suffer a heart attack than a woman who remains married, according to a new study. What surprised researchers at the Duke University School of Medicine was that the risk remained higher even if she remarries.

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Divorced men, however, had about the same risk for a heart attack as a man who remained married. Researchers said their study was one of the first "to look at the cumulative effect of divorce over a long period."

The study examined data on about 15,000 adults ages 45-80 over an 18-year period ending in 2010. It was published in the American Heart Association's scientific journal Circulation: Cardiovascular Quality and Outcomes.