Page 15 - Health, Population and Environment Education 10

Measurement of Fertility
Fertility can be measured by four different ways. They are as follows:

a. Crude Birth Rate (CBR) b. General Fertility Rate (GFR)
c. Age Specific Fertility Rate (ASFR) d. Total Fertility Rate (TFR)

a. Crude Birth Rate(CBR)
The total live births taken place among 1000 mid year population in a certain place in a
year is called as crude birth rate.
Mathematically,
Total live births in a place in a year
CBR = × 1000
Mid year population of that place in the same year
It is expressed per 1000.

In order to calculate crude birth rate, there is need of data on mid year population as well
as total live births.

Mid Year Population
Mid year population is the mean of total population in a certain place in a year.

Mathematically,
Population at the beginning of a year + Population at the end of a year
Mid year population =
2
or,
Population of Jan. 1 + Population of Dec. 31
st
st
Mid year population =
2
Note:
Live birth means birth of an alive baby. It means a baby needs to cry, respire, move
muscles, blink eyes, should have heart beat, feel pulse, etc.

Worked out example: 1
In a district, in 2014 A.D. there was 797456 population and 143672 live births took place in
that district in that year. Calculate crude birth rate of that district in that year.

Solution:

Given
In a district in 2014 A.D.,
Total population = 797456

GREEN Health, Population and Environment Education Book-10 15