HSCI 130 Lecture Notes - Lecture 3: Case Fatality Rate, Public Health, Cumulative Incidence
17 Mar 2016
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Population- group of people with common characteristics (age, sex, race); 2 types of pop, based on whether membership is permanent or transient. Fixed pop- membership is permanent, deined by an event (a-bomb survivors) Dynamic pop- membership is transient & deined by being in or out of a state (vancouverites) Want to quantify disease occurrence in a pop. Measures of disease frequency should take into account: # of individuals afected with the disease, size of source pop o. Epidemiology needs the number and characteristics of disease cases, of people with risk factors, and of the population from which the above people are derived. Numbers of cases, or people with the risk factors comprise the numerator; the population from which they come is the denominator. The fraction, numerator divided by the denominator, is usually called the rate in epidemiology. A ratio is one number in relation to another, and a rate is a ratio.
