Age statistics form an important component of population analysis, as most of the analysis is based on age-sex structure of the population. High fertility due to social, cultural and perhaps religious and economic condition. An of a population pyramid for Brookings, South Dakota is available. The sex ratio of a population may either be expressed as the number of males per 100 females or as the number of females per 100 males. These bars are then layered on top of each other. Monthly patterns within stone types did not vary significantly by sex. When the sex ratio is defined as the number of males per 100 females, the sex ratio above 100 indicates a high sex ratio, while that below 100 is considered to be a low sex ratio.
In general, the sex differences in stone composition were much less prominent over age 70 years and most marked under age 30 years. Age- sex structure is one of the most important characteristics of population composition. By implication, during childhood males outnumber females of the same age; the different decreases as age increases; at some point in the adult life span, the numbers of males and females become equal; as higher ages are reached, the number of females becomes quite large. In fact, Japan has experienced a over the past four years. Ratios above 1,000 indicate excess of females over males; those below 1,000 indicate a deficit of females. Such countries may once have had progressive structures and may, in future, have regressive structures. This means that youthful age structures correspond to highly fertile populations, typical of developing countries.
A larger size of population in the age group of 15-59 years indicates the chances of having a larger working population. Rural-Urban Composition: The division between rural and urban areas is significant in terms of geographical distribution of population. Rapid growth is indicated by a pyramid with a large percentage of people in the younger ages. The universal characteristics of human populations are fundamental to understanding demographic processes of fertility, mortality and migration. Nevertheless, the very large number of stones available for this study allowed us to detect clear trends in the case mix of stone composition, which suggest important age, sex, and seasonal effects. Discussion Our study identified important demographic and seasonal features that are associated with the type of stone that a given patient is likely to form. After age 45 the attrition process accelerates, causing the narrowing peak of all population pyramids.
Many demographers believe that left to its own, this is an unalterable constant. We may take the youngest segment of the population at the base, and move on to the older segments till the oldest comes at the top. In a study of about two million births that took place in hospitals and health centres throughout India during 1949- 58, the sex ratio at birth was found to be 942 for the country as a whole. Some people are overweight but have no other risk factors, such as high cholesterol or high blood pressure. The general rule for developing countries is that the rate of growth of urban areas is twice that of the population as a whole.
In a separate report from the same referral stone clinic, urine pH was also noted to be higher in a group of both men and women who transformed from CaOx to calcium phosphate. Age Groups: The age structure of a given country or region may be analyzed on the basis age groups. Developing countries such as Bolivia and Angola. Changes in fertility generally produce the biggest changes in a society's age structure, regardless of the level of mortality. Norm can also vary among people of certain races and ethnicities. However, males experience higher mortality at virtually all ages after birth.
Generally, people in the age group of 15-30 years are more mobile than the people in the younger and older age groups. The social, economic and political implications of these age groups and the geographical variation in their distribution are worthy of serious consideration. Surprisingly enough, the attitude of society towards children, the youth and elderly people is affected by the sex-age distribution of the population. This point may be further established with illustrations. The Japanese population is projected to about 107 million by 2050.
Although there are no standardized break points, yet the ages of 15 and 60 years are the most commonly used break points in the developing countries and 15 and 65 years in the developed countries. In old age to the females suffer greater neglect than their male counterparts. It is projected that there would be about eight billion city dwellers in the world by 2030, and 80 per cent of them would be living in developing countries. Pyramid shape — Narrower base with equally wide subsequent age groups tapering off gradually. At the same time a decline in mortality influences the sex structure at the older ages by producing increasingly greater numbers of females and males. On the other hand, if the number of children in the population is high, the dependency ratio will be high.
A stationary age structure of population is one in which birth and death rate unchanged over a long period of time. Alternative Title: age composition Age distribution, also called Age Composition, in studies, the proportionate numbers of persons in successive age categories in a given population. The sex ratio of the Germany is below 90, while those of India, Pakistan, Bangladesh, Iran and China have values which exceed 105. Each year a new cohort is born and appears at the bottom of the pyramid, while the cohorts above it move up. Sex and age are the basic characteristics or the biological attributes, of any demographic group and affect not only its demographic but also its social, economic and political structure, for they influence birth and death rate, internal and international migration, marital status composition, manpower, the gross national product, planning regarding educational and medical services and housing etc. Demographers use population pyramids to describe age distribution of populations.
Get the most out of Medical News Today. Population data are invariably classified by sex and age and then made available to data users. In the developed countries, the number of females in this age group is more than that of the males because the proportion of population in this age group is governed largely by mortality rates, and since the male mortality rate in the developed countries is higher than that of the females at all ages, the females tend to outnumber the males in this age group. The sex composition of the population in India is a matter of concern, being much lower than 950 for a long time. Thus, we are not able to separate first time versus recurrent stones or compare stone composition with the number of stone events. Age structures of particular countries are most commonly shown diagrammatically, using age-sex pyramids. Generally, the over-all sex ratios of the populations of most countries fall within the narrow range of about 95 to 105.
That is why; most of the countries in Asia excluding Japan, Singapore, Hong Kong and South Korea , Latin America and Africa have high fertility. The present discussion on sex-structure will be based on the former definition of sex ratio, for this is the one that is followed the world over, though the Indian census has preferred to follow the latter definition. Factors such as obesity, diabetes, and diet have all been implicated. These observations suggest that postmenopausal changes make older women more similar to men in their risk of stones, and this may explain the lack of sex differences in stone composition in the older age ranges. Age distributions differ among countries mainly because of differences in the levels and trends of.