Estimated number of twin people living human twins in the world is approximately 125 million in 2006. (about 1.9% of world population), with just 10 million mono-zygotic twins (roughly 0.2% of the world population and 8% of all twins). The twin birth rate in United States in 2004, 2005 & 2006 was little bit over 32 twin live births per 1,000 live births.
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