Abstract
In Australia over 25% of the population experience a mental disorder each year and ∼12% of the population use a health service for mental health problems each year.1 The most prevalent of these disorders are depression, anxiety disorders and substance use. Dementia is currently the fifth leading cause of disease burden and, with an ageing population, by 2016, the disability burden of dementia will be the highest of any disease in Australia.2 There is a paucity of longitudinal research on factors influencing the development of and recovery from mental disorders over the adult age span. In response to this lack of research, the personality and total health through life (PATH) project was established in 1999 by A.F.J., H.C. and B.R. It has been funded almost entirely through grants from the National Health and Medical Research Council.

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