Demographic measures are the actual changes in size, composition and distribution due to changes in demographic components like birth, death and migration, as a result of their respective processes like rate of fertility, mortality and migration.
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Fertility refers to the reproductive function. It is the ability to bear offspring. It is the production of live birth which starts when a women gives the first birth. Its period is generally 15-49 years of age.
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The measures that are used to estimate fertility rate are as follows: - Crude Birth Rate(CBR), Age-Specific Fertility Rate(ASFR), Total Fertility Rate(TFR)