It is a single index that summarizes the age distribution of a population. Currently, the median age ranges from a low of about 15 in Niger and Uganda to 40 or more in several European countries and Japan. See the entry for "Age structure" for the importance of a young versus an older age structure and, by implication, a low versus a high.
Population growth rate : The average annual percent change in the population, resulting from a surplus or deficit of births over deaths and the balance of migrants entering and leaving a country.
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The rate may be positive or negative. The growth rate is a factor in determining how great a burden would be imposed on a country by the changing needs of its people for infrastructure e. Rapid population growth can be seen as. Birth rate : This entry gives the average annual number of births during a year per 1, persons in the population at midyear; also known as crude birth rate.
The birth rate is usually the dominant factor in determining the rate of population growth. It depends on both the level of fertility and the age structure of the population.
Death rate : This entry gives the average annual number of deaths during a year per 1, population at midyear; also known as crude death rate. The death rate, while only a rough indicator of the mortality situation in a country, accurately indicates the current mortality impact on population growth. This indicator is significantly affected by age distribution, and most countries will eventually show a rise in the overall death rate, in spite of continued decline in mortality at all ages, as declining.
Net migration rate : This entry includes the figure for the difference between the number of persons entering and leaving a country during the year per 1, persons based on midyear population. An excess of persons entering the country is referred to as net immigration e. The net migration rate indicates the contribution of migration to the overall level of population chan. Urbanization : This entry provides two measures of the degree of urbanization of a population. The first, urban population, describes the percentage of the total population living in urban areas, as defined by the country.
The second, rate of urbanization, describes the projected average rate of change of the size of the urban population over the given period of time. For example. Major urban areas - population : This entry provides the population of the capital and up to six major cities defined as urban agglomerations with populations of at least , people.
An urban agglomeration is defined as comprising the city or town proper and also the suburban fringe or thickly settled territory lying outside of, but adjacent to, the boundaries of the city. For smaller countries, lacking urban centers of , or more, only the population of the capital is presented. Sex ratio : This entry includes the number of males for each female in five age groups - at birth, under 15 years, years, 65 years and over, and for the total population. Sex ratio at birth has recently emerged as an indicator of certain kinds of sex discrimination in some countries.
For instance, high sex ratios at birth in some Asian countries are now attributed to sex-selective abortion and infanticide due to a strong preference for sons. This will affect future marriage patterns and fertilit. Mother's mean age at first birth : This entry provides the mean average age of mothers at the birth of their first child. It is a useful indicator for gauging the success of family planning programs aiming to reduce maternal mortality, increase contraceptive use — particularly among married and unmarried adolescents — delay age at first marriage, and improve the health of newborns.
Maternal mortality rate : The maternal mortality rate MMR is the annual number of female deaths per , live births from any cause related to or aggravated by pregnancy or its management excluding accidental or incidental causes. The MMR includes deaths during pregnancy, childbirth, or within 42 days of termination of pregnancy, irrespective of the duration and site of the pregnancy, for a specified year.
Infant mortality rate : This entry gives the number of deaths of infants under one year old in a given year per 1, live births in the same year. This rate is often used as an indicator of the level of health in a country.
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Life expectancy at birth : This entry contains the average number of years to be lived by a group of people born in the same year, if mortality at each age remains constant in the future. Life expectancy at birth is also a measure of overall quality of life in a country and summarizes the mortality at all ages. It can also be thought of as indicating the potential return on investment in human capital and is necessary for the calculation of various actuarial measures. Total fertility rate : This entry gives a figure for the average number of children that would be born per woman if all women lived to the end of their childbearing years and bore children according to a given fertility rate at each age.
The total fertility rate TFR is a more direct measure of the level of fertility than the crude birth rate, since it refers to births per woman. This indicator shows the potential for population change in the country. A rate of two children per woman is considered the replaceme. Contraceptive prevalence rate : This field gives the percent of women of reproductive age who are married or in union and are using, or whose sexual partner is using, a method of contraception according to the date of the most recent available data.
It is also useful in understanding, past, present, and future fertility trends, especially in developing countries. Drinking water source : This entry provides information about access to improved or unimproved drinking water sources available to segments of the population of a country. Improved drinking water - use of any of the following sources: piped water into dwelling, yard, or plot; public tap or standpipe; tubewell or borehole; protected dug well; protected spring; or rainwater collection. Unimproved drinking water - use of any of the following sources: unprotected dug well; unprotected spring; cart with small tank or.
Current Health Expenditure : Current Health Expenditure CHE describes the share of spending on health in each country relative to the size of its economy. It includes expenditures corresponding to the final consumption of health care goods and services and excludes investment, exports, and intermediate consumption.
CHE shows the importance of the health sector in the economy and indicates the priority given to health in monetary terms. Physicians density : This entry gives the number of medical doctors physicians , including generalist and specialist medical practitioners, per 1, of the population. Medical doctors are defined as doctors that study, diagnose, treat, and prevent illness, disease, injury, and other physical and mental impairments in humans through the application of modern medicine. They also plan, supervise, and evaluate care and treatment plans by other health care providers.
The World Health Organization estimates that f. Hospital bed density : This entry provides the number of hospital beds per 1, people; it serves as a general measure of inpatient service availability. Hospital beds include inpatient beds available in public, private, general, and specialized hospitals and rehabilitation centers.
In most cases, beds for both acute and chronic care are included. Because the level of inpatient services required for individual countries depends on several factors - such as demographic issues and the burden of disease - there is. Sanitation facility access : This entry provides information about access to improved or unimproved sanitation facilities available to segments of the population of a country.
Improved sanitation - use of any of the following facilities: flush or pour-flush to a piped sewer system, septic tank or pit latrine; ventilated improved pit VIP latrine; pit latrine with slab; or a composting toilet. Unimproved sanitation - use of any of the following facilities: flush or pour-flush not piped to a sewer system, septic tank. Major infectious diseases : This entry lists major infectious diseases likely to be encountered in countries where the risk of such diseases is assessed to be very high as compared to the United States. These infectious diseases represent risks to US government personnel traveling to the specified country for a period of less than three years.
The degree of risk is assessed by considering the foreign nature of these infectious diseases, their severity, and the probability of being affected by the diseases present. Obesity - adult prevalence rate : This entry gives the percent of a country's population considered to be obese.
BMI is calculated by taking a person's weight in kg and dividing it by the person's squared height in meters. Children under the age of 5 years underweight : This entry gives the percent of children under five considered to be underweight. Underweight means weight-for-age is approximately 2 kg below for standard at age one, 3 kg below standard for ages two and three, and 4 kg below standard for ages four and five.
This statistic is an indicator of the nutritional status of a community. Education expenditures : This entry provides the public expenditure on education as a percent of GDP. Literacy : This entry includes a definition of literacy and UNESCO's percentage estimates for populations aged 15 years and over, including total population, males, and females. There are no universal definitions and standards of literacy. Unless otherwise specified, all rates are based on the most common definition - the ability to read and write at a specified age.
Detailing the standards that individual countries use to assess the ability to read and write is beyond the scope of the Factbook. School life expectancy primary to tertiary education : School life expectancy SLE is the total number of years of schooling primary to tertiary that a child can expect to receive, assuming that the probability of his or her being enrolled in school at any particular future age is equal to the current enrollment ratio at that age. Caution must be maintained when utilizing this indicator in international comparisons.
For example, a year or grade completed in one country is not necessarily the same in terms of educational content or qualit. Unemployment, youth ages : This entry gives the percent of the total labor force ages unemployed during a specified year. Government :: Afghanistan. Country name : This entry includes all forms of the country's name approved by the US Board on Geographic Names Italy is used as an example : conventional long form Italian Republic , conventional short form Italy , local long form Repubblica Italiana , local short form Italia , former Kingdom of Italy , as well as the abbreviation.
Also see the Terminology note. Government type : This entry gives the basic form of government. Definitions of the major governmental terms are as follows. Note that for some countries more than one definition applies. Anarchy - a condition of lawlessness or political disorder brought about by the absence of governmental authority. Authoritarian - a form of government in whic. Capital : This entry gives the name of the seat of government, its geographic coordinates, the time difference relative to Coordinated Universal Time UTC and the time observed in Washington, DC, and, if applicable, information on daylight saving time DST.
Where appropriate, a special note has been added to highlight those countries that have multiple time zones. Administrative divisions : This entry generally gives the numbers, designatory terms, and first-order administrative divisions as approved by the US Board on Geographic Names BGN. Changes that have been reported but not yet acted on by the BGN are noted. Geographic names conform to spellings approved by the BGN with the exception of the omission of diacritical marks and special characters.
Independence : For most countries, this entry gives the date that sovereignty was achieved and from which nation, empire, or trusteeship. For the other countries, the date given may not represent "independence" in the strict sense, but rather some significant nationhood event such as the traditional founding date or the date of unification, federation, confederation, establishment, fundamental change in the form of government, or state succession.
For a number of countries, the establishment of statehood.
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National holiday : This entry gives the primary national day of celebration - usually independence day. Independence Day, 19 August The history subfield includes the dates of previous constitutions and the main steps and dates in formulating and implementing the latest constitution. Legal system : This entry provides the description of a country's legal system. A statement on judicial review of legislative acts is also included for a number of countries. The legal systems of nearly all countries are generally modeled upon elements of five main types: civil law including French law, the Napoleonic Code, Roman law, Roman-Dutch law, and Spanish law ; common law including United State law ; customary law; mixed or pluralistic law; and religious law including Islamic law.