1. The natural movements of
the population
The changes produced by biological factors
receive the name of natural movements
Natural
Natality Mortality
Increase
2. dividing the
number of births a
The Birth rate 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. General fecundity
rate is calculated
by dividing the
The fecundity rate
number of babies
that are born
alive in one year It measures the number of children per
by the number of woman in fertile age (15-49 years) . In
women in fertile order to guarantee the maintenance of the
age population we need a figure of about
two
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
