Page 54 - Niên giám

Population density Population (persons)
2
2
(persons/km ) = Territorial area (km )
Sex ratio of the population reflects number of males per 100
females. Sex ratio of the population is determined by the following formula:

Sex ratio Total of males
of the population = Total of females × 100
Crude birth rate: The indicator measures the fertility of the

population, is one of the two components of natural population increase.
High or low value of crude birth rate can affect the size, structure and
population growth rate. Crude birth rate indicates that for every 1,000
people, how many live births are in the reference period.

B
CBR =  1000
P

Where:

CBR: Crude birth rate;

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:

7 B
TFR  5  i  1000
i 1 W i

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