They are a useful graphic, also called age-sex pyramids, representation that give us the information to analyze population distribution and population change
Population numbers are the x-axis and age groups are on the y-axis.
*As we can see it can also be focused on only one sector of the population.
It shows:
- How many individuals are alive in different age groups cohorts in a country or region for any given year.
- Show the male-female ratio
Types of Pyramid Shapes.
Stage 1. Expanding – High CBR *(, rapid fall in each upward age group due to high CDR, short life expectancy.
Stage 2. Expanding – High CBR, fall in
CDR as more individuals live to the middle age, slightly life expectancy.
Stage 3. Stationary – declining CBR, low CDR, more individuals live to old age.
Stage 4. Contracting – low CBR, low CDR, higher dependency ratio (those that cannot work), longer life expectanxy
LEDC’s tend to be in stage 1 and 2, while MEDC’s are in the 3 and 4 stages.
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