Overview
In descriptive epidemiology, the objective is to describe a specific health condition from three different perspectives: time, person, and place. For example, some diseases are seasonal. Some people are more at risk for a particular illness than others. Some diseases are endemic in one country but not in others.
Centers for Disease Control and Prevention. (2011). Lesson 1: Introduction to epidemiology. In Principles of epidemiology. http://www.cdc.gov/ophss/csels/dsepd/ss1978