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对１９９１～１９９５年北京市计划生育智残儿童鉴定的情况进行分析。被确定的３４７名智力残疾儿童，主要来自近郊区及远郊区（占９３．１％）。其中轻度智残占４２．７％，中度占３９．５％，重度占１２．１％，极重度占５．８％。在已知病因中，孕期感染、中毒、疾病等不良刺激，惊厥引起的脑缺氧、损伤，出生窒息和低出生体重是主要致残因素。在后天因素中，父母的文化、职业对儿童的智力影响起着不容忽视的重要作用。
Analysis of the identification of children with mental retardation in family planning in Beijing from 1991 to 1995. A total of 347 children with mental retardation were identified, mainly from the suburbs and outlying areas (93.1%). Among them, mild mental residual accounted for 42.7%, moderate accounted for 39.5%, severe accounted for 12.1%, extremely severe accounted for 5.8%. Among the known causes, adverse pregnancy stimulation, poisoning, disease and other adverse stimuli, cerebral anoxia caused by convulsions, injury, birth asphyxia and low birth weight are the main causes of disability. In acquired factors, parents’ culture and occupation have an important role that can not be ignored in children’s intellectual influence.