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在美国 ,唐氏综合征 (ＤＳ)已明确为精神发育迟缓最为常见的原因。在所有种族组中其现患率 (大约每 80 0活产婴儿中一人 )相似。 5 0年来 ,出生后第一年ＤＳ患儿的存活率有很大提高。从 1942 -195 2年出生队列的 5 0 %到 1980 -1996队列的91%。大多数关于ＤＳ患者存活的研究都
In the United States, Down’s syndrome (DS) has been identified as the most common cause of mental retardation. The prevalence rate (approximately one in every 80 live births) is similar in all ethnic groups. In the past 50 years, the survival rate of children with DS in the first year of life has greatly improved. From 1942 -195 20% of the birth cohort to 91% of the 1980 -1996 cohort. Most studies on the survival of DS patients are