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Twin births reach the top of history

Researchers from OXford University announced that the rate of twin births has increased by a third, with advances in infertility treatment over the past 40 years.

Identical twins occur when a fertilized egg divides into two, and fraternal twins occur when there are two fertilized eggs in the mother’s womb at the same time. Today, more than one fertilized egg is transferred to the mother’s uterus at the same time in methods such as in vitro fertilization, which are used to increase the chance of pregnancy.


Christiaan Monden, professor of sociology and demography at Oxford University, said, “The data are really striking. Over the past 40 to 50 years, we’ve seen a strong increase in infertility treatment rates in rich and developed countries, and it’s more than we’ve seen before, both in relative and absolute terms. gave birth to twins. “

However, Dr. Monden and colleagues stated that while the birth rate for identical twins has remained virtually unchanged over time, they have discovered that twins born as a result of medically assisted reproduction have increased globally.

As the age of the mother increases, the probability of twin birth increases

Among the other drivers that increase twin birth are increased access to hormone therapy and other obstetrics services, as well as delayed parenting, the researchers said. Researchers said that having fraternal twins increases with age, reaching a peak between the ages of 35 and 39.

In the scope of the study published in Human Reproduction magazine, scientists analyzed the birth rates between 2010-15 in 165 countries covering 99 percent of the world population.

Globally, twin rates have increased from 9 to 12 per thousand births since the 1980s. However, the picture varies greatly from country to country. . The biggest increases were seen in North America (71%), Europe (60%) and Asia (32%). In the UK, the twin birth rate has increased by about 62 percent, but is thought to have declined since the Human Fertilization and Embryology Authority (HFEA) launched a campaign to reduce multiple births in 2007.


On the other hand, the study stated that there are a high percentage of twins born naturally from two separate eggs in Africa. Also, according to the study, 80 percent of twins are currently born in either Africa or the USA.

“The number of twin births has increased everywhere except South America. The numbers have increased by more than 80 percent in North America and Africa. But in Africa this increase is almost entirely due to population growth rather than medical support,” Monden said.

Raj Mathur, president of the British Fertility Association and a gynecologist at St Mary’s Hospital in Manchester, said:

“We are not surprised by the increased rates of twin births because the increased availability of medical reproduction and also the fact that women are a little older both increase the chances that the first birth will be twin. But at the same time, if you look at Western Europe, especially the UK and Scandinavian countries, you can see that the rates are lower than they were in 2010 and 2015. “Most twin babies are certainly fine, but there is no doubt that twin pregnancy carries greater risks for the mother and baby, this “That’s why different countries take various measures to prevent twin births,” he said.


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