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Article: Demography
- Article from:
- Encyclopedia of Public Health
- Author:
CopyrightCOPYRIGHT 2002 The Gale Group Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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DEMOGRAPHY
Demography is the study of the growth, change, and structure of the human population. Changes in a population's size and structure are caused by changes in the birthrate, the death rate, and the net migration rates. Demographic research focuses on why people have the number of children they do; on factors that affect death rates; and on the reasons for immigration, emigration, and geographic mobility. Understanding a society's demography is an essential tool in determining current and future public health needs.
HISTORY OF THE HUMAN POPULATION
The twentieth century was a very unusual period, demographically. World population grew at a more rapid and sustained pace than at any ...
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