The age-sex structure of a population is the cumulative result of past trends in fertility, mortality, and migration. For gender balance as a socio-political issue, see Gender equality. Ratio of males to females in a population. See also population pyramid.
For instance, a child dependency ratio of 0.
Info Print Cite. Generally, slightly more males are born than females a typical ratio would be or males for every females. Age distributionalso called Age Compositionin population studies, the proportionate numbers of persons in successive age categories in a given population. The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree Single Account.
In the United States inthe death rate was highest among those aged 85 and over, with about 14, 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.
Nuptiality The frequency, characteristics, and dissolution of marriages in a population. It is also known that in cooperative breeders where both sexes are philopatric like the varied sittella adult sex ratios are equally or more male-biased than in those cooperative species, such as fairy-wrenstreecreepers and the noisy miner  where females always disperse.
Bibcode : Natur. As the infection progresses, the immune system becomes weaker, and the person becomes more susceptible to infections.
Rate of Natural Increase or Decrease The rate at which a population is increasing or decreasing in a given year due to a surplus or deficit of births over deaths, expressed as a percentage of the base population. See also population pyramid. Population Register A government data collection system in which the demographic and socioeconomic characteristics of all or part of the population are continuously recorded.
Completed Fertility Rate The number of children born per woman to a cohort of women by the end of their childbearing years.