Table 40.1 Organic brain disorders of medium + (GAF 60-1) impairment. First incidence per 1000 years at risk (ì) with 95% confidence intervals (CI)

Source: Reproduced with permission from Australian & New Zealand Journal of Psychiatry, 2007; 41(2):178-186

Male and female age-standardized first-incidence rates of dementia and other organic brain disorders every fifth year from 1947-97 are seen in Figure 40.1. In both males and females a trend of decreasing incidences of dementia can be observed from 1947-97, while five-year incidences of other organic brain disorders remained fairly constant through the whole period.

There are a limited number of studies that have tried to ascertain secular trends of dementia incidence. However, in a study from Rochester, Minnesota, no significant change of the incidence of dementia was seen from 1960 to 1984^17,18. One difference from the Lundby study was the shorter length of the observation period. A long period of study might be needed to be able to see a slow change over many years¹⁸.

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