Define: Epidemiology, Incidence, Prevalence & Lifetime Prevalence.
Epidemiology: Scientify study of frequency & distribution of disorder within a ppopulation.
Incidence: Number of new cases of a disorder that appear in a popultions during a specifc period of time.
Prevalence: Total number of active cased old & new that are present in a population during a specifc period of time
Lifetime Prevalence: Total proportion of people in a given population who have been affected by the diorder at some point in their lives.