By editor
Originally published on Wed January 4, 2012 1:40 pm
The number of twins born each year in the United States has more than doubled since 1980, federal health officials reported Wednesday.
For most of the last century the rate at which American women gave birth to twins remained steady at about 2 percent of all births.
But the rate increased steadily between 1980 and 2009, according to the latest data from the National Center for Health Statistics. And by 2009, more than 3 percent of all births produced twins.
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