【摘要】 作者于１９９０年４月对兰州市某城镇和农村１５岁以上人口进行了精神发育迟滞的流行学调查，共查出精神发育迟滞患者１１０例，患病率２．５７‰，其中男性患病率２．８１‰，女性患病率２．２５‰，两者无显著差异（Ｐ＞０．０５）。城市患病率２．１９‰，农村患病率３．８４‰，以农村显著较高（Ｐ＜０．０１）。在各年龄组中以１５～２９岁组患者为最多。先天性因素所致者较多。家庭经济水平及文化程度低的人群中较多更多还原

【Abstract】 AbstractAn epidemiological study of mental retardation among subjects above 15 years old in an urban and arural area of Lanzhou city was made in April,1990.This revealed 110 cases of mental retardation,giv-ing an overall prevalence of 2.57‰(male: 2.81‰;female:2. 25‰).There was no significant differ-ence between the sexes; Prevalence in the urban (2.19‰)and rural(3.84‰)areas was significantlydifferent(P<0.01).The 15-29 years old was the most commonly affected age group. Congenital fac-tors were more common than post·natal factors as causes of mental retardation,which was also morefrequent in people with lower socioeconomic and educational levels.更多还原