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作者对96例缺乏Down综合征表型的精神幼稚症儿童进行了核型研究。男孩48例,女孩48例,年龄从1岁零10个月～10岁。89例有严重智力缺陷,7例是轻度痴呆。精
The authors performed a karyotypic study of 96 children with mental retardation who lacked the phenotype of Down syndrome. 48 boys and 48 girls, aged from 1 year old 10 months to 10 years old. 89 cases had severe mental retardation and 7 cases had mild dementia. fine