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BY DR: MUHAMMED NAJEEBAssist: Professor
Community Medicine Deptt: LUMHSJamshoro Sind, PAKISTANE mail [email protected]
DEMOGRAPHY
POPULATION PYRAMIDS
Pictorial presentation of 3 Factors (Influence Population)Births
DeathsMigration
Features (Population Pyramids)
In terms of its composition by:- Age, Sex Males (on Left side) Females (on Right side) Children (at bottom) Elders (at Top) Adjoining bars (contribution of each age, Sex group)
Developing Country (Pakistan)
Base: Broad (High Birth rate)Top: Narrow / Acute apex (No: of Elders (Less)
High Dependency rateBad effect (on Economy) Unproductive (Half Pop) Under 15 Ys: ---- 44% Pop: B/w 15- 64 Ys: 52% Pop:
Developed Countries (Sweden)
Base: Narrow (Low Birth rate)Middle: Bulge (Convex border)Top: Obtuse apex (More Elders)
Low Dependency rateGood effect (on Economy) Productive ( More than Half Pop) Under 15 Ys: ---- 25% Pop: Above 15 Ys: ---- 75% Pop:
EXAMPLE
PAKISTAN
DEMOGRAPHIC CHARACTERISTICS
Population unevenly distributed with
All countries in region have a positive rate of natural population change.
very densely populated areas
very sparsely populated areas.
DEMOGRAPHIC TRANSITIONGrowth Rate (%) Grading of population
increase
0 ( Zero)
0 to 0.5
0.5 to 1
1 to 1.5
1.5 to 2.0
> 2
Stationary Growth (No Growth)
Slow Growth
Moderate Growth
Rapid Growth
Very Rapid Growth
Explosive Growth ( Population explosion) OR Population Bomb
DEMOGRAPHIC TRANSITION 3 TYPES
1. Old balance Fertility Mortality
2. New balance Fertility Mortality
3. ImbalanceFertility Mortality
India in 1920
Many countries of S. Asia & Africa
India, China,SingapurPak in 1970
Germany,Hungary
DEMOGRAPHIC CYCLE
END