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  • Age-Sex Structure – Geography Notes – For W.B.C.S. Examination.
    Posted on November 22nd, 2019 in Geography
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    Age-Sex Structure – Geography Notes – For W.B.C.S. Examination.

    বয়স-লিঙ্গ কাঠামো – ভূগোল নোট – WBCS পরীক্ষা।

    The most important demographic characteristic of a population is its age-sex structure. Age-sex pyramids (also known as population pyramids) graphically display this information to improve understanding and make comparison easy. The population pyramid sometimes has a distinctive pyramid-like shape when displaying a growing population.Continue Reading Age-Sex Structure – Geography Notes – For W.B.C.S. Examination.

    How to Read an Age-Sex Graph

    An age-sex pyramid breaks down a country or location’s population into male and female genders and age ranges. Usually, you’ll find the left side of the pyramid graphing the male population and the right side of the pyramid displaying the female population.

    Along the horizontal axis (x-axis) of a population pyramid, the graph displays the population either as a total population of that age or as a percentage of the population at that age. The center of the pyramid starts at zero population and extends out to the left for males and right for females in increasing size, or proportion of the population.

    Along the vertical axis (y-axis), age-sex pyramids display five-year age increments, from birth at the bottom to old age at the top.

    Some Graphs Actually Look Like a Pyramid

    Generally, when a population is growing steadily, the longest bars of the graph will appear at the bottom of the pyramid and will generally decrease in length as the top of the pyramid is reached. This indicates a large population of infants and children, which declines toward the top of the pyramid due to the death rate.

    Age-sex pyramids graphically display long-term trends in the birth and death rates but also reflect shorter-term baby-booms, wars, and epidemics.

    Age Structure The proportion of the total population in each age group.

    Age-Sex Structure The composition of a population as determined by the number or proportion of males and females in each age category. The age-sex structure of a population is the cumulative result of past trends in fertility, mortality, and migration. Information on age-sex composition is essential for the description and analysis of many other types of demographic data. See also population pyramid.

    Age-Specific Rate Rate obtained for specific age groups (for example, age-specific fertility rate, death rate, marriage rate, illiteracy rate, or school enrollment rate).

    Aging of Population A process in which the proportions of adults and elderly increase in a population, while the proportions of children and adolescents decrease. This process results in a rise in the median age of the population. Aging occurs when fertility rates decline while life expectancy remains constant or improves at the older ages.

    Antinatalist Policy The policy of a government, society, or social group to slow population growth by attempting to limit the number of births.

    Antiretroviral therapy (ART) Treatment of people infected with human immunodeficiency virus (HIV) using anti-HIV drugs. The standard treatment consists of a combination of at least three drugs (often called “highly active antiretroviral therapy” or HAART) that suppress HIV replication. Three drugs are used in order to reduce the likelihood of the virus developing resistance. ART has the potential both to reduce mortality and morbidity rates among HIV-infected people, and to improve their quality of life.

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