Abstract
A recent study of more than one million consecutive live births in British Columbia found that 53/1000 had diseases with an important genetic component before approximately 25 years of age (Baird et al., 1988). Down syndrome was only 2.3% of this total (1.22/1000), but studies of severe mental retardation in children over 1 year of age in two Swedish counties found 33% had Down syndrome, out of a prevalence of severe mental retardation at 1 to 16 years of age of 3.5/1000 (Gustavson et al., 1977a,b). Additionally, the prevalence rate of retardation dropped 42% from 1959–1962 to 1967–1970 in these studies, mainly as a result of a 54% decline in births with Down syndrome. More recent reports (Hook, 1983a; Kiely, 1987) supported these results. Baird and Sadovnick (1988a) also showed that the probability of survival of live births with Down syndrome has continued to increase, and that currently 44% survive to age 60. These studies reinforce the substantial contribution births with Down syndrome make to the problem of human health, and the positive result to be obtained from their prevention.
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Huether, C.A. (1990). Epidemiologic Aspects of Down Syndrome. In: Kalter, H. (eds) Issues and Reviews in Teratology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0521-7_7
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