Clarke M, Lowry R, Clarke S
Age Ageing. 1986 Sep;15(5):278-84. doi: 10.1093/ageing/15.5.278.
Previous studies have suggested that up to a fifth of people over the age of 80 years may suffer severe dementia-like illnesses. This total population survey of over a thousand people over the age of 75 suggests that the prevalence of marked cognitive impairment is much less than expected. However, differences in the age structure, representativeness, response rates and size of the samples surveyed, together with differences in methods of measurement, make comparison between studies difficult.
先前的研究表明，80岁以上的人群中，多达五分之一的人可能患有严重的痴呆样疾病。这项针对一千多名75岁以上人群的全面人口调查表明，明显认知障碍的患病率远低于预期。然而，调查对象的年龄结构、代表性、回应率和样本规模存在差异，再加上测量方法的不同，使得各研究之间难以进行比较。
