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The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...
The power of twin designs arises from the fact that twins may be either identical (monozygotic (MZ), i.e. developing from a single fertilized egg and therefore sharing all of their polymorphic alleles) or fraternal (dizygotic (DZ), i.e. developing from two fertilized eggs and therefore sharing on average 50% of their alleles, the same level of genetic similarity found in non-twin siblings).
Twin Birth Rate Kodinhi: India: Asia: 204 sets of twins and 2 sets of triplets born to 2,000 families [1] Velyka Kopanya Ukraine: Europe: 122 twins in a population of 4,000 [2] Igbo-Ora: Nigeria: Africa: 45 to 50 sets of twins per 1000 live births [3] Cândido Godói: Brazil: South America: One in 10 births involves twins [4] Mohammadpur Umri ...
In 2004, of the people younger than 35 who gave birth with the help of IVF, 32.7% delivered twins, and 4.9% delivered triplets, according to doctors at the Washington University School of Medicine ...
Triplet brothers at graduation. A multiple birth is the culmination of one multiple pregnancy, wherein the mother gives birth to two or more babies.A term most applicable to vertebrate species, multiple births occur in most kinds of mammals, with varying frequencies.
A twin study compares the concordance rate of identical twins to that of fraternal twins. This can help suggest whether a disease or a certain trait has a genetic cause. [3] Controversial uses of twin data have looked at concordance rates for homosexuality and intelligence. Other studies have involved looking at the genetic and environmental ...
After all, shortly after the fateful ultrasound, I discover that the odds of us having gotten spontaneously pregnant with twins, meaning without fertility assistance or genetic influence, were ...
A multiple pregnancy (e.g., twins, triplets, etc.) carried to viable gestational age is still counted as 1. [3] Abortus is the number of pregnancies that were lost prior to viable gestational age for any reason, including induced abortions or miscarriages but not stillbirths. The abortus term is sometimes dropped when no pregnancies have been lost.