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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.
From Wikipedia: Incidence (epidemiology) is the risk of developing some new condition within a specified period of time. Prevalence. in epidemiology, is the proportion of a population found to have a condition (typically a disease or a risk factor such as smoking or seat-belt use). Written Jan 29, 2014 â¢ View Upvotes â¢ Answer requested by Quora User.