Trisomy (technical term), or Down Syndrome (widely known), comes in many forms. The most common are Trisomy 13, 18, and 21. German technology in 1934 dictated only the strong should live. Right now, over 90% of those with Down Syndrome are aborted/killed. Over 99% of adults with Down say they are happy with their lives, but vast amounts are killed because their care is deemed too much of a bother for their parents.
We know Down Syndrome (Trisomy 21), has an abortion rate of about 90%. Trisomy 13 &18 are aborted at a much higher frequency because their likelihood of death soon after birth is much higher.