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Epidemiology is the study (or the science of the study) of the
patterns, causes, and effects of health and disease conditions
in defined populations. It is the cornerstone of public health,
and informs policy decisions and evidence-based medicine by
identifying risk factors for disease and targets for preventive
medicine. Epidemiologists help with study design, collection and
statistical analysis of data, and interpretation and
dissemination of results (including peer review and occasional
systematic review). Epidemiology has helped develop methodology
used in clinical research, public health studies and, to a
lesser extent, basic research in the biological sciences.
Major areas of epidemiological study include disease etiology,
outbreak investigation, disease surveillance and screening,
biomonitoring, and comparisons of treatment effects such as in
clinical trials. Epidemiologists rely on other scientific
disciplines like biology to better understand disease processes,
statistics to make efficient use of the data and draw
appropriate conclusions, social sciences to better understand
proximate and distal causes, and engineering for exposure
assessment.
