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１９９１年１０月至１９９７年６月通过遗传咨询观察了智力低下（ＭＲ）儿童１６８０例，其中男性占５３．３％，女性占４６．７％；伴癫痫者占１１．２％，伴脑瘫者占２１％；第一胎占８２．６％；轻度ＭＲ占７３．８％，中度ＭＲ占２２．９％，重度ＭＲ占３．３％。染色体核型异常检出率为１４．６％，其中常染色体异常占７３．１％，性染色体异常占２６．９％。在病因探讨中，属于出生前因素占４１．２％，出生时因素占２６．５％，出生后因素占２．７％，原因不明占２９．６％。
From October 1991 to June 1997, 1680 children with mental retardation (MR) were observed through genetic counseling, of which 53.3% were male and 46.7% were female; those with epilepsy accounted for 11.2%, with cerebral palsy Accounting for 21%; first birth accounted for 82.6%; mild MR accounted for 73.8%, moderate MR accounted for 22.9%, severe MR accounted for 3.3%. Chromosome karyotype abnormality detection rate was 14.6%, of which autosomal abnormalities accounted for 73.1%, sex chromosome abnormalities accounted for 26.9%. In the etiology of the study, 41.2% of prenatal factors, 26.5% of postnatal factors, 2.7% of postnatal factors and 29.6% of unknown reasons.