Three decades of twin births in the United States, 1980-2009.

  title={Three decades of twin births in the United States, 1980-2009.},
  author={Joyce Martin and Brady E. Hamilton and Michelle J K Osterman},
  journal={NCHS data brief},
The number of twins has doubled and the rate of twin births has risen by more than three-fourths over the three decades 1980–2009. Increases in twin birth rates averaged more than 2 percent annually from 1980 to 2004, but the pace of increase slowed to less than 1 percent from 2005 to 2009. The increase in twinning over the three decades has been widespread, occurring across age and race and Hispanic origin groups, and in all states within the United States. The largest increases have been… CONTINUE READING
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