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一、群体中精神发育不全的发病率由于精神发育不全(Oligophrenia,简称OP)尚缺统一的命名标准,以致各家报导的发病率差异很大。一般约在0.22%—5—6%,个别作者甚至报告高达9.6%。Bremer认为OP发病率差异如此之大其中原因是诊断标准问题和调查方法问题。只是在孤立的或半孤立的地区与城市之间的发病率才是真的不同。如Bremer调查挪威北部农村中的发病率为5.6%,Akessor调查瑞典西北岛上居民患严重OP者占0.61%。农村群体中的OP发病率比城市高。Левucy调查城市的发病率为0.67%,农村为1.04%。Amnell调查严重OP的发病率城
First, the incidence of mental retardation in the population As a result of mental retardation (Oligophrenia, referred to as OP) a unified naming standard, resulting in a very different incidence of various reports. Generally about 0.22% -5-6%, individual authors even reported up to 9.6%. Bremer thinks the difference in the incidence of OP is so great because of the problems of diagnostic criteria and investigative methods. Just the incidence between isolated and semi-isolated areas and cities is really different. For example, Bremer surveyed 5.6% of the rural population in northern Norway and Akessor surveyed 0.61% of residents with severe OP in the Northwestern island of Sweden. The incidence of OP in rural areas is higher than in urban areas. Левucy surveyed the city’s incidence rate of 0.67%, 1.04% in rural areas. Amnell investigated the prevalence of severe OP in the city