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Dịch tễ học nguồn gốc và định nghĩa (Waterhouse, 1998) là một khoa học về cơ bản vay mượn từ các ngành khoa học khác để hình thành khu vực chuyên môn riêng của mình. Dịch tễ học từ thực tế có thể được chia thành ba phần: epi đầu tiên, có nghĩa là "trên", sau đó giới thiệu, đó là dân số, và cuối cùng ology, trong đó đề cập để nghiên cứu. Vì vậy, chúng ta có thể trong một hình thức đơn giản nói rằng dịch tễ học là nghiên cứu các sự kiện xảy ra khi. | EPIDEMIOLOGY ORIGINS AND DEFINITIONS Epidemiology Waterhouse 1998 is a science that basically borrows from the other sciences to form its own area of expertise. The actual word epidemiology can be broken down into three parts first epi which means upon then demo which is population and finally ology which refers to studying. So we can in a simple form say epidemiology is the study of events that occur upon or on populations or groups. Overall epidemiology is not interested in the individual but rather the population however these data are often used to relate and infer risks to an individual. The field of epidemiology interacts with other science areas and rarely functions on its own. For example in the study of occupational diseases there may be an interaction of occupational exposure and health effects in determining the risk of a specific disease Stern 2003 . Biostatistics the study of statistical relationships for biological systems is an area often in close association with epidemiologists. It could even be argued that epidemiologists cannot easily function without using basic biostatistics. Thus epidemiologists are routinely trained in the basics of biostatistics as well. In addition it is not uncommon for some epidemiologists to have been originally trained or cotrained in other disciplines e.g. environmental health . The field of epidemiology can be broken down into different subject areas. In the simplest form it can be grouped as acute e.g. accidents chronic e.g. type II diabetes and infectious e.g. malaria . However it can also be grouped by subject name such as occupational epidemiology environmental epidemiology cardiovascular epidemiology and so forth. The other way of classifying epidemiology is by disease name such as malaria epidemiology epidemiology of heavy metals and so forth. Thus like most scientific fields of study this area can be categorized in many different ways depending on one s prospective. In this chapter we are concerned with the .
