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The sex and age distributions of population. The 1990 revision of the United Nations global population estimates and projections.
New York, New York, United Nations, 1991. viii, 391 p. (Population Studies No. 122; ST/ESA/SER.A/122)This statistical report includes the estimated and projected age distribution of the population based on high, medium, and low variants for 152 countries with populations greater than 300,000 between 1950 and 2025 in 5-year intervals. A world total as well as by continents and subregions are available along with the spatial groups; least developed countries, less developed regions (excluding China), the Economic Commission for Africa, Latin America and the Caribbean, Asia, and the Pacific, Western Asia, and sub-Saharan Africa. Grouped data reflect countries with populations both greater than and less than 300,000. This revision was begun in 1988 and completed in 1990 by the UN Population Division of the International Economic and Social Affairs Department in conjunction with other UN regional commissions and the Statistical Office. A discussion of methods and data used for these estimates, a summary of findings, and selected demographic indicators will be available in World Population Prospects, 1990, and in summary form in the UN World Population Chart, 1990. A magnetic tape and diskettes of these data are available on request for purchase.
MECHANISMS OF AGEING AND DEVELOPMENT. 1991 Jan; 57(1):25-48.Demographic data published by the UN in 1987 are analyzed in terms of the Gompertz function. Projections for maximum lifespans are obtained, with the data broadly divisible into 3 clusters. These are attributable not only to the influence of high infant mortality, but suggest constitutional and/or environmental variations among members of the clusters. The difference between lifespan and life expectancy is estimated analytically. A comparison with earlier analysis supports the view that there are important differences between the life expectancies of the sexes.
New York, New York, United Nations, 1987. ix, 385 p. (ST/ESA/SER.R/70.)The report presents the estimated and projected sex and age distributions according to the medium, high, and low variants for population growth for 1950-2025 for countries and areas generally with a population of 300,000 and over in 1980. The data for smaller countries or areas are included in the regional population totals and are not given separately. This report supplements the report on the WORLD POPULATION PROSPECTS: ESTIMATES AND PROJECTIONS AS ASSESSED IN 1984, which presents methods, data, assumptions, and a summary of major findings of the estimates and projections, as well as selected demographic indicators for every country or area of the world. The sex and age distributions of population in this report are based on the 10th round of the global demographic assessments undertaken by the UN Secretariat. They are derived from data that were available to the UN generally by the beginning of 1985; therefore, the figures presented supercede those that were previously published by the UN.
In: Third Asian and Pacific Population Conference (Colombo, September 1982). Selected papers. Bangkok, Thailand, Economic and Social Commission for Asia and the Pacific, 1984. 9-40. (Asian Population Studies Series No. 58)This report summarizes the recent demographic situation and considers prospective trends and their development implications among the 39 members and associate members of the Economic and Social Commission for Asia and the Pacific (ESCAP). It presents data on the following: size, growth, and distribution of the population; age and sex structure; fertility and marriage; mortality; international migration; growth and poverty; food and nutrition; households and housing; primary health care; education; the working-age population; family planning; the elderly; and population distribution. Despite improvements in the frequency and quality of demographic data collected in recent years, big gaps continue to exist in knowledge of the demographic situation in the ESCAP region. Available evidence suggests that the population growth rate of the ESCAP region declined between 1970 and 1980, as compared with the preceding decade, but that its rate of decline was slow. Within this overall picture, there is wide variation, with the most developed countries having annual growth rates around 1% and some of the least developed countries having a figure near 3%. The main factors associated with the high growth rates are the past high levels of fertility resulting in young age structures and continuing high fertility in some countries, notably in middle south Asia. The population of countries in the ESCAP region is expected to grow from 2.5 billion in 1980, to 2.9 billion in 1990, and to 3.4 billion persons by the year 2000. This massive growth in numbers, which will be most pronounced in Middle South Asia, will occur despite projected continuing moderation in annual population growth rates. Fertility is expected to continue its downward trend, assuming a more widespread and equitable distribution of health, education, and family planning services. Mortality is expected to decline further from its current levels, where life expectancy is often at or around 50 years. In several countries, more than 10 in every 100 babies born die before their 1st birthday. The extension of primary health care services is seen as the key to reducing this figure. Rapid population growth and poverty tend to reinforce each other. Low income, lack of education, and high infant and child mortality contribute to high fertility, which in turn is associated with high rates of natural increase. High rates of natural increase feed back to depress socioeconomic development. High population growth rates and their correlates of young age structures and heavy concentrations of persons in the nonproductive ages tend to depress production and burden government expenditure with high costs for social overhead needs. Rapid population growth emerges as an important factor in the persistence of chronic undernutrition and malnutrition. It increases the magnitude of the task of improving the educational system and exacerbates the problem of substandard housing that is widely prevalent throughout Asia.
In: Population prospects in developing countries: structure and dynamics, edited by Atsushi Otomo, Haruo Sagaza, and Yasuko Hayase. Tokyo, Japan, Institute of Developing Economies, 1985. 1-15, 325. (I.D.E. Statistical Data Series No. 46)This discussion covers the prospects of population growth in Asian countries, prospects of changes in sex-age structures in Asian countries, and the effect of urbanization on national population growth in developing countries. According to the UN estimates assessed in 1980, size of total population of Asian countries recorded 2580 million in 1980, which accounted for 58.2% of total population of the world. As it had shown 1390 million, accounting for 55.1% of the world population in 1950, it grew at a higher annual increase rate of 2.08% than that of 1.90% for the world average during the 30 years. On the basis of the UN population projections assessed in 1980 (medium variant), the world population attains 6121 million by 2000, and Asian population records 3555 million, which is 58.0% of the total population of the world and which is a slightly smaller share than in 1980. The population of East Asia shows 1475 million and that of South Asia 2077 million. During 20 years after 1980, the population growth becomes much faster in South Asia than in East Asia. After 1980 the population growth rate in Asia as well as on the world average shows a declining trend. In Asia it indicates 1.72% for 1980-90 and 1.50% for 1990-2000, whereas on the world average it shows 1.76% and 1.49%, respectively. The population density for Asia showing 94 persons per square kilometer, slightly lower than that of Europe (99 persons) as of 1980, records 129 persons per square kilometer and exceeds that of Europe (105 persons) in 2000. According to the UN estimates assessed in 1980, the sex ratio for the world average indicates 100.7 males/100 females as of 1980, and it shows 104.1 for Asia. This is higher than that for the average of developing countries (103.2). In the year 2000 it is observed generally in the UN projections that the countries with a sex ratio of 100 and over as of 1980 show a decrease but those with the ratio smaller than 100 record an increase. Almost all Asian countries are projected to indicate a decrease in the proportion of population aged 0-14 against the increases in that aged 15-64 and in that aged 65 and older between 1980-2000. In 1980 the proportion of population aged 0-14 showed more than 40.0% in most of the Asian countries. In the year 2000 almost all the countries in East Asia and Eastern South Asia indicate larger than 60.0% in the proportion of adult population. Urbanization brings about the effects of reducing the speed of increase in a national population and of causing significant changes in sex and age structures of the national population. Considering the future acceleration of urbanization in Asian countries, the prospects of growth and changes in sex and age structures of populations in Asian countries may need to be revised from the standpoint of subnational population changes.