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* Down syndrome, caused by trisomy of the 21st chromosome, overall is seen in about 1 in 750 live births. The incidence, however, increases dramatically with increasing maternal age. If you look at the link below, under about age 30, there is a 1:1000 chance in having a child with Down syndrome, however, at age 40, there is about a 1:100 chance. This increases to 1:10 by age 50.

80% of all children with Down syndrome are born to women under the age of 30, however, because women of this age group have children at a much higher rate than those over 30.

* Approximately 1 in 800-1,000 babies are born with Down syndrome. * The overall incidence of Down's syndrome is 1 in 660 newborns, thereby making it the most common pattern of malformation in man. === === * According to scientific data, Down syndrome occurs in 1 out of every 750 births.

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About 1 in 700 babies in the United States is born with Down syndrome, making it one of the most common chromosomal conditions. The exact percentage varies by region and population.

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Q: Percentage of people that are affected by downsyndrome?
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