The global rate of twin births has risen by a third since the 1980s, from 9 per 1000 births to 12 per 1000. Christiaan Monden at the University of Oxford and his colleagues generated the figures by gathering existing data from 165 countries from 1980 to 2015.
Twins are also more likely to survive now, thanks to medical advances. “The rates are higher than they have been for 50 years,” says Monden. “This is likely to be an all-time high.”
Most of the increase has been in fraternal or non-identical twins, who develop from separate eggs and sperm. The rate of identical twins, caused by an embryo splitting in two in the first few days after fertilisation, has stayed about the same.
Read more: https://www.newscientist.com/article/2270822-the-number-of-twins-in-the-world-is-the-highest-it-has-ever-been/#ixzz6p0ENTExY
Read more: https://www.newscientist.com/article/2270822-the-number-of-twins-in-the-world-is-the-highest-it-has-ever-been/#ixzz6p0ENTExY
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