The composition of a population according to age groups and gender is known as the age-sex structure. It can be represented by means of a population pyramid.
\nPicture
\nPopulation pyramids
\nThe vertical axis of a population pyrmaid has the population in age bands of 5 years and the horizontal axis shows that number or % of males and females. The pyramid shows longevity by its height.
\nPopulation pyramids can show:
\n\u00b7 The results of births minus deaths in specific age groups
\n\u00b7 The effects of migration
\n\u00b7 The effects of events such as war, famine and disease
\n\u00b7 An indication of the overall life expectancy of a country<\/p>\n
Age structure can also be measured by a number of indices:
\n\u00b7 The dependency ratio
\n\u00b7 The support ratio
\n\u00b7 The juvenility index
\n\u00b7 The old-age index<\/p>\n
The dependency ratio shows the relationship between the economically active (working) population and the non-economically active (dependent) population
\nLinks between the DTM and age-sex structure<\/p>\n","protected":false},"excerpt":{"rendered":"