Epidemiology is that the study and analysis of the distribution (who, when, and where), patterns and determinants of health and malady conditions in outlined populations.

It is the cornerstone of public health and shapes policy choices and evidence-based observe by distinctive risk factors for malady and targets for preventive aid. Epidemiologists facilitate with study style, collection, and applied mathematics analysis of information, amend interpretation and dissemination of results (including referee and occasional systematic review). Medicine has helped develop methodology employed in clinical analysis, public health studies, and, to a lesser extent, basic analysis within the biological sciences.