Epidemiology for geochemists

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Abstract
Epidemiologists study the distribution and the determinants of disease in human populations. Geochemists may be more concerned to find diseases to fit the observed patterns of geochemistry. This paper is concerned with the application of epidemiological techniques to the interrelations between health, disease and geochemistry, with particular reference to the hazards of man-made chemicals in the environment. Descriptive studies of disease in terms of person, place and time allow for crude comparison with the results of geochemical mapping and for the development of hypotheses. Analytical studies allow for the exploration of these hypotheses but demand careful sampling techniques and vigorous quality control. The epidemiological approach should be directed towards the identification of national/regional problems and of high-risk groups, the definition of priorities and the opportunities for preventative measures. The problems and possibilities for epidemiological research are illustrated from recent and current studies.

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