1. The natural movements of
the population
The changes produced by biological factors
receive the name of natural movements
Natural
Natality Mortality
Increase
2. The Birth rate
It is calculated by
dividing the number of
births a year in a place
by total population ; the
result is multiplied by
one thousand.
Remember, it is
expressed in so many
people per thousand
TN = number of births a year
total population * 1000
If one country with a population of 100.000 inhabitants had been born
2000 children . Which will be the birth rate?
TN= 2000
100.000 * 1000 = 20 %0 Remember per thousand
4. The fecundity rate
It measures the number of
children per woman in fertile
age (15-49 years) . In order to
General fecundity rate is guarantee the maintenance of the
calculated by dividing the population we need a figure of
number of babies that are
about two
born alive in one year by
the number of women in
fertile age
There are 20.000 women in fertile age and this year has
been born 150 children . Calculate the fecundity rate .
GFR= 150
20.0000 *1000 = 1, 5 %0 Will the maintenance
of the population be guaranteed or not ?
5. Mortality or death rate
It is the number of deaths a year in a population . It is
calculated by dividing the number of deaths a year in a
place by its total population ; the result is multiplied
by thousand
There are 1.000 deaths in a country and there , there are
30.000 people . Calculate this death rate
DR= 1000
30.000 *1000 = 33.3 %0
6. Think: Why the Spanish death rate is higher than Chinese death rate?
Explain it !!!!
7. Infant mortality rate
It indicates the number of deaths of babies under
one year of age per 1,000 live births. The rate in a
given region, therefore, is the total number of
newborns dying under one year of age divided by
the total number of live births during the year,
then all multiplied by 1,000. The infant mortality
rate is also called the infant death rate (per 1,000
live births).
There are 28 dead children and 1.750 live births . Calculate this
infant mortality rate
IMI= 28
1.750 * 1000 = 16 %0
9. Life expectancy
It is the average number
of years that a newborn
child is thought to live .
It is higher in the rich
countries
10. Natural increase
It is the existing difference between the
number of births and deaths in a population
at given time. RNI= BR-DR
It is positive when the figure of births is
higher than figure of deaths and it is negative
the other way round
