According to the 2005 CDC data on IVF in-vitro fertilization, about 1 in 3 IVF cycles resulted in a pregnancy. And of these pregnancies, about 1 in 3 pregnancies were twins, triplets or higher: Of these pregnancies, 28.5% were twins (25-times higher than natural pregnancies), and 4.4% were triplets (300+-times higher than natural pregnancies).  





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