Objective To investigate the incidence of Down's syndrome in live birth infants delivered in the hospital, and the effect of prenatal screening in reducing the incidence of Down's syndrome.
目的探讨住院分娩活产婴儿中唐氏综合征的发生率，以及产前筛查对降低唐氏综合征发生率的作用。
Objective To investigate the incidence of Down's syndrome in live birth infants delivered in the hospital, and the effect of prenatal screening in reducing the incidence of Down's syndrome.
目的探讨住院分娩活产婴儿中唐氏综合征的发生率，以及产前筛查对降低唐氏综合征发生率的作用。
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