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CBR =
1000
P
B
Where:
B: Total live births in the reference period;
P: Population up to the reference time-point.
Total fertility rate
(TFR) reflects the average number of live births that
would be born per woman (or a group of women) during the childbirth period if
the woman (or a group of women) passes age-specific fertility rates observed in a
given reference period during the reproductive period (aged 15 to 49).
In case the specific fertility rates are calculated by age groups (age-interval of
each group is 5 years) then index “i” expresses 7 age groups, including: 15-19, 20-
24, 25-29, 30-34, 35-39, 40-44 and 45-49. Total fertility rate is calculated by the
following formular:
1000
W
B
5 TFR
7
1i
i
i
Where:
B
i
: Number of live births in the reference period of women in the age group
(i);
i : i
th
age group;
W
i
: Number of women of the i
th
age group up to the reference time-point.
The coefficient of 5 in the above formula is applied for the average rate of
consecutive 5-year age groups so that the TFR will be commensurate with the
age-specific fertility rates described in this formula.
Crude death rate
is one of the two components of natural population
increase. High or low value of crude death rate can affect the size, structure and
population growth rate. Crude death rate indicates that for every 1000 people,
how many deaths are in the reference period.
Where:
CDR: Crude death rate;
D: Total of deaths in the reference period;
P: Population up to the reference time-point.
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.
CDR =
D
× 1000
P