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The twin birth rate has increased 70 percent since 1980
Year Twin Births Sets of Twins Total Births Twin Birth Rates
2005 133,122 66,561 4,138349 32.2 per 1000
2004 132,219 66,110 4,112,052 32.2
1980 68,339 34,170 3,612,258 18.9
2008 - It is estimated that there are a total of 265,341 4-5 year olds who are twins.
Prepared 7/29/08 – Reference: National Vital Statistics Reports, Vol. 56, No. 6, December 5, 2007
