MethodsThe epidemiological survey of intellectual impairment was carried out in various areas in Jiangshu. 9998 children were screened by Denver Development Screening Test(DDST),Gesell Development Scale and CCMD-2-R.

• 方法抽查江苏省某地0~6岁儿童9998人,采用丹佛发育筛选测验(DDST)量表进行筛查,用CCMD-2-R儿童精神发育迟滞诊断标准、盖塞尔(Geseel)发展量表进行诊断。