Compared with the world pattern of crude birth rates, the world pattern of crude death rates shows more variation because of the vast inequalities in the population.
The crude birth rate indicates the number of live births occurring throughout the year, per 1,000 population calculable at midyear. Subtracting the crude death rate from the crude birth rate provides the speed of natural increase, which is capable of the rate of population change in the absence of migration.
The birth rate (along with mortality and migration rates) is employed to calculate population growth. The estimated average population is also taken because of the mid-year population. The total (crude) birth rate (which includes all births)—typically indicated as births per 1,000 population—is distinguished from a group of age-specific rates (the number of births per 1,000 persons, or a lot of typically 1,000 females, in each age group).
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