The net reproduction rate (NRR) is the average number of daughters that would be born to a woman (or a group of women) if she passed through her lifetime conforming to the age-specific fertility and mortality rates of a given year. This rate is similar to the gross reproduction rate
Gross reproduction rate
The gross reproduction rate is the average number of daughters that would be born to a woman if she survived at least to the age of 45 and conformed to the age-specific fertility rate of a given year.... but takes into account that some women will die before completing their childbearing years. An NRR of one means that each generation of mothers is having exactly enough daughters to replace itself in the population.
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The net reproduction rate (NRR) is the average number of daughters that would be born to a woman (or a group of women) if she passed through her lifetime conforming to the age-specific fertility and mortality rates of a given year. This rate is similar to the gross reproduction rate
Gross reproduction rate
The gross reproduction rate is the average number of daughters that would be born to a woman if she survived at least to the age of 45 and conformed to the age-specific fertility rate of a given year.... but takes into account that some women will die before completing their childbearing years. An NRR of one means that each generation of mothers is having exactly enough daughters to replace itself in the population. See also total fertility rate
Total Fertility Rate
The total fertility rate of a population is the average number of children that would be born to a woman over her lifetime if she were to experience the exact current age-specific fertility rates through her lifetime, and she were to survive from birth through the end of her reproductive life.... and replacement-level fertility
Sub-replacement fertility
Sub-replacement fertility is a total fertility rate that is not high enough to replace an area's population. In developed countries sub-replacement fertility is below approximately 2.1 children per woman's life time, but the threshold could be as high as 3.3 in some developing countries because of higher mortality rates.... .
The NRR is particularly relevant where sex ratios at birth are significantly affected by the use of reproductive technologies, or where life expectancy is low.
