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Infant mortality rate is the measure of the mortality level of

children in the first year of life. This rate is defined as the number of
children under one year of age per 1000 live births in the reference
period on average.

D
IMR  0  1000
B

Where:

IMR: Infant mortality rate;

D0: Number of deaths of children under one year of age in the
reference period;

B: Total of live births in the reference period.

Under five mortality rate is the measure of mortality level of
children in the first five years of life. This rate is defined as the

number of deaths of children under age 5 per 1,000 live births in the
reference period on average.

D
U 5 MR  5 0  1000
B

Where:

U5MR: Under five mortality rate;

5D0 : Number of deaths under age 5 in the reference period;

B: Total of live births in the reference period.

Natural growth rate of population is the difference between
number of live births and number of deaths compared to the average
population during the reference period, or the difference between the

crude birth rate and the crude death rate of population in the reference
period.

B  D
NIR   1000  CBR  CDR
P

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