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对于收容所内智力迟钝患者进行核型分析,已有过不少的报导。这些调查报告表明患者核型异常的发生率约占患者总数的10～15％,此外,最常见的核型异常是Down氏综合征。但是在日本仅有过一次这样的调查(1974年藤田),所调查的人数较少,而且似乎对Down氏综合征的发生率估计得太低,对性染色体异常的比例又估计得太高。此次我们对一个有代表性的收容机构进行了调查,以期能提供有关染色体异常的类型、
There have been quite a few reports of karyotyping in patients with mental retardation in shelters. These reports indicate that the incidence of karyotypic abnormalities in patients accounts for about 10 to 15% of the total number of patients, in addition, the most common karyotypic abnormalities are Down’s syndrome. However, only one such survey (Fujita, 1974) was conducted in Japan, with fewer people being surveyed, and it seems that the incidence of Down’s syndrome is estimated to be too low and the proportion of anomalous sex chromosomes estimated too high. This time we conducted a survey of a representative institution to provide information on the types of chromosomal abnormalities,