The number of twins globally has increased by a third compared to three decades ago
Researchers says that medically assisted reproduction is a major contributor to this increase
The number of twins being born is now higher than ever before, according to a recent global overview published in the journal
In the 1980s, the natural twinning rate was high in African countries, but fairly low in regions like East Asia and South America, and at an intermediate level in Europe and North America.
Researchers of the present study collected information on national twinning rates for two periods: 1980–1985 and 2010–2015. Information for the period 2010–2015 was collected from 165 countries (which make up 99% of the world’s population) and from 112 countries for the period 1980–1985.