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epidemiology. the science concerned with the study of the factors determining and influencing the frequency and distribution of disease, injury, and other health-related events and their causes in a defined human population for the purpose of establishing programs to prevent and control their development and spread.
In other words, descriptive epidemiology describes the distribution of disease (recall that epidemiology is the study of the distribution and determinants of disease in populations).escriptive epidemiology seeks to summarize conditions based on person, place, and time by analyzing disease (or other outcomes of exposure) patterns.