Twin births are on the rise around the world: so much in history

Twin births are on the rise around the world: so much in history

Rome – an unusual phenomenon. The world’s “twins” are on the rise. Do not talk about zodiac signs. There is a jump in twin births in the world: there are more than 1.6 million births per year, and practically every 42 newborns are twins. This is it The highest peak in the last forty years, perhaps in all the history of mankind, Further use of medical reproductive technologies may also be achieved Due to the increasing age of the mothers. Experts at the University of Oxford, the French Institute of Demographic Studies (INED), and the Dutch University of Radboud attest to the numbers collected in more than 100 countries. The results were published in the journal Human Reproduction.

The researchers examined births registered in 165 countries (99% of the world’s population) between 2010 and 2015 and compared with those registered in these 112 countries during 1980-1985. The twin birth rate increased by a third, from 9 to 12 per thousand.

For experts, it is the main “engine” that drives this growth Expansion of medically assisted reproductive techniques: Not only in vitro fertilization, but also ovarian stimulation and artificial insemination. Developed in the most developed countries of the 1970s, they spread to Asia and Latin America between the 1980s and 1990s, and after 2000 reached rich regions in Africa and South Asia.

“The relative and absolute number of twins in the world It is the highest peak in the middle of the twentieth century and represents the highest peak ever. “, Says Christian Monton, a sociologist at Oxford University. “Most data indicate that we are the richest country in the world, especially in Europe and North America, and Africa will be a major driver in the coming decades,” explains INED’s Demographer Gilles Pison.

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“The number of twins has increased everywhere except in South America,” Monton points out. “In North America and Africa, the number has increased by more than 80 percent This increase is due to population growth in Africa. ”

at the moment, Globally, 80% of twin births occur between Africa and Asia. “This rate is very high in Africa because many dysgotic twins are born there, or twins from two different egg cells,” Monton points out. “This is because of the genetic differences that separate the African people from others.”

Worldwide, the growth of multiple births is accelerated by ‘different twins’, while monozygotic twins are stable at four births per thousand.

It is important to know these numbers well, especially in poor and developing countries, because “twin births – including Montan – are associated with higher mortality rates among newborns and infants and more complications for mothers and children during pregnancy and childbirth.” “We need to pay more attention to the future of twins in low- and middle-income countries,” concludes Geron Smiths of Radboud University. “In sub-Saharan Africa, in particular, many twins lose siblings in the first year of life, ranging from 200,000 to 300,000 each year.”

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