智障儿童是指智力明显低于一般水平,在成长期间(即十八岁前)在适应行为方面有缺陷。根据世界精神科分类手册第四册(DSM-IV),智障人士是在十八岁之前被评估出智力明显低于普通人,即智商在七十或以下,并且在以下的生活范畴中有两项或以上相对于同文化同年龄的人发展得迟缓而适应有困难的——沟通、自我照顾、家居生活、社交、使用社区资源、认路、学术、工作、余暇、健康及安全。智障是永久的缺陷,既不是疾病, Mentally handicapped children are those whose intelligence is significantly lower than normal and are deficient in their adaptive behavior during their growth (ie, before the age of 18). According to Volume IV of the World Handbook of Psychiatric Manual (DSM-IV), people with intellectual disability are appraised before the age of eighteen as having a markedly lower level of intelligence than the average person, that is, having a IQ of seventy or less, and two in the following categories of life Item or above is slow to adapt to those who are at the same age as those of the same culture - Communication, self-care, home life, socialization, use of community resources, orientation, academic, work, leisure, health and safety. Mental retardation is a permanent defect that is neither a disease,