Epidemiology examines the distribution and determinants of health-related states in specified populations, and therefore the use of this examine to the control of health problems. Epidemiology is that the study of how often diseases occur in several groups of individuals and why. Epidemiological information is engaged to plan and appraise strategies to stop illness and as a guide to the management of patients in whom disease has already developed. Like the clinical findings and pathology, the epidemiology of a disease is an integral a part of its basic description. The subject has its special techniques of knowledge collection and interpretation, and its necessary jargon for technical terms. This short book aims to supply an ABC of the epidemiological approach, its terminology, and its methods. Our only assumption are going to be that readers already believe that epidemiological questions are worth answering. Epidemiology may be a science with sound methods of scientific inquiry at its foundation. Basic epidemiologic methods tend to believe careful observation and use of valid comparison groups to assess whether what was observed, like the amount of cases of disease in a specific area during a particular period of time or the frequency of an exposure among persons with disease, differs from what could be expected.      

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