9.2 - Development, demographic change and population structures
Population data help explain the needs and opportunities of places, but similar numbers can have different causes. This demographic subdivision of 9.2 connects fertility, mortality, natural increase and population structure with development. It applies those ideas to dated UK, India and Niger data and real population pyramids.
Define the measure and its denominator
A crude birth rate is annual live births per 1,000 people; a crude death rate is annual deaths per 1,000 people. “Crude” means that the rates have not been standardised for differences such as age structure. They concern the whole population, not only people of childbearing age.
The total fertility rate estimates the number of children a woman would have if she experienced the current age-specific fertility rates throughout her reproductive life. It is measured in births per woman, not births per 1,000 residents. It is a summary of current rates, not a prediction of every woman's choices or a count of completed families.
The infant mortality rate measures deaths before age one per 1,000 live births. The maternal mortality ratio measures maternal deaths related to pregnancy or childbirth per 100,000 live births, using the source's formal definition. The denominators differ, so numbers cannot be compared as if they were the same kind of percentage.
| World Bank WDI estimates for 2023 | UK | India | Niger |
|---|---|---|---|
| Total fertility, births per woman | 1.56 | 1.98 | 6.06 |
| Crude birth rate, per 1,000 people | 10.0 | 16.1 | 41.9 |
| Crude death rate, per 1,000 people | 9.5 | 6.6 | 8.9 |
| Infant mortality, per 1,000 live births | 4.1 | 24.5 | 66.9 |
| Maternal mortality, per 100,000 live births | 8 | 80 | 350 |
WDI series retrieved October 2026; rounded as displayed. These are dated estimates assembled from their international/national sources and may differ from a country's registered counts or an older data release.
Separate natural change from migration
Natural population change is births minus deaths. It is positive when births exceed deaths and negative when deaths exceed births. Migration affects total population change separately.
The second expression applies when both rates are per 1,000 people for the same period and population.
Using the displayed rounded Niger values: 41.9 − 8.9 = 33.0 per 1,000, or 3.30% per year. India gives 16.1 − 6.6 = 9.5 per 1,000, or 0.95%. These are approximate results because the table is rounded. Multiplying a rate by a population estimates a number of people; the rate itself is not that number.
A country with negative natural change can still grow if net immigration is sufficiently positive. Conversely, positive natural increase can coexist with population decline if emigration is large. Treating a population-growth graph as a fertility graph would miss this distinction.
Development changes survival and reproductive choices
Safe water, nutrition, vaccination and healthcare can improve survival and reduce infant mortality. Access to skilled care during pregnancy and childbirth can reduce maternal risk. A national income rise helps only if households can actually obtain services; distance, cost and discrimination can leave unequal outcomes.
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