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精神发育不全是一组以智能低下为主要特征的精神病。1960年以前,国内各地统计的患病率是0.47～1.97‰,1973年我们在市区16万人口的调查中,发现这组疾病的患病率为1.14‰。
Mental hypoplasia is a group of mental disorders characterized by mental retardation. Before 1960, the prevalence rate of statistics in various parts of China was between 0.47 and 1.97 ‰. In our survey of 160,000 people in urban areas in 1973, the prevalence of this disease was 1.14 ‰.