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Download A History of Epidemiologic Methods and Concepts by Alfredo Morabia (auth.), Alfredo Morabia (eds.) PDF

By Alfredo Morabia (auth.), Alfredo Morabia (eds.)

Methods, simply as ailments or scientists, have their very own background. it is crucial for scientists to concentrate on the genesis of the tools they use and of the context within which they have been developed.

A heritage of Epidemiologic tools and Concepts is predicated on a set of contributions which seemed in "SPM foreign magazine of Public Health", beginning in January 2001. The contributions specialize in the old emergence of present epidemiological equipment and their relative value at various closing dates, instead of on particular achievements of epidemiology in controlling plagues similar to cholera, tuberculosis, malaria, typhoid fever, or lung melanoma. The papers current the layout of potential and retrospective reviews, and the strategies of bias, confounding, and interplay. The compilation of articles is complemented by way of an advent and reviews by way of Prof. Alfredo Morabia which places them within the context of present epidemiological research.

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1), chronic and acute leukemia had similar incidence rates, but the prevalence of chronic leukemia was higher because its time to death was on average 2 years vs. about 2 months for acute leukemia. In reality, this simple, mechanical physics-looking expression, Prevalence = Incidence x Duration (P = I x D), serves more heuristic than practical purposes. Its exact formulation is more complicated, and it is based on the assumption that the composition and disease experience of the population remains relatively stable.

5. Prevalence and incidence We have seen that prevalence measures the accumulation in the population of events (exposures or diseases) that occurred in the distant or recent past, while incidence is a predictive statement about cases-to-be in a population still free of the disease. The two concepts are closely related and their relationships have been explored at least under two different perspectives: a) the relation of incidence to prevalence of disease; b) the relation of (excess) incidence to prevalence of exposure.

In the example given by MacMahon et al. 1), chronic and acute leukemia had similar incidence rates, but the prevalence of chronic leukemia was higher because its time to death was on average 2 years vs. about 2 months for acute leukemia. In reality, this simple, mechanical physics-looking expression, Prevalence = Incidence x Duration (P = I x D), serves more heuristic than practical purposes. Its exact formulation is more complicated, and it is based on the assumption that the composition and disease experience of the population remains relatively stable.

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