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The dependency ratio is a demographic measure of the ratio of the number of dependents to the total working-age population in a country or region.

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The birth rate in a period is the total number of live births per 1,000 population divided by the length of the period in years. It's the ratio between the number of live-born births in the year and the average total population of that year.

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Life expectancy is the age a person can expect to live based on the statistical average for an area.

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Canada's total dependency load: 34.3%
Japan's total dependency load: 41.2%
Nigeria's total dependency load: 46%

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Canada's life expectancy: 7.9%
Japan's life expectancy: 15.2%
Nigeria's life expectancy: 0.6%

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Canada's birth rate: 5.3
Japan's birth rate: 3.7
Nigeria's birth rate: 16.3

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We care about Canada's, Japan's, and Nigeria's dependency load because we use it to measure the pressure on the productive population. Consideration of the dependency ratio is essential for governments, economists, bankers, businesses, industries, universities, and all other major economic segments which can benefit from understanding the impacts of changes in population structure.

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We care about Canada's, Japan's, and Nigeria's life expectancy rates because governments look at the life of expectancy to measure the health of populations in different times, places, and groups. It is one of those key measures we use to compare countries. Average life expectancy increases as counties become richer.

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We care about Canada's, Japan's, and Nigeria's birth rates because they tell us a lot about community health, and are an important measure in overall health science. Health professionals closely monitor birth rates as they rise and fall, and measure these trends to track important changes and what they may mean for our society’s future. It is important for us to know about birth rates because in some developing countries we need to know the result in lacking resources and infrastructure, including crowded schools and health clinics.

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Canada has the second-lowest life expectancy due to poverty it is directly linked to chronic stress that can drastically influence health outcomes and thus lower life expectancy. Japan has the highest life expectancy because it's the high life expectancy of the Japanese is mainly due to fewer deaths from ischemic heart disease, including myocardial infarction, and cancer. Nigeria has the lowest life expectancy due to the country having a lot of health issues, with the AIDS epidemic as the major player in the low life expectancy. That apart, Nigeria has one of the highest child and maternal mortality rates and the widespread growth of the poliovirus in the world.

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Japan has the lowest birth rate due to men finding fewer lifelong job opportunities which affect their marriage prospects since a woman in Japan seeks men with stable jobs. Canada's birth rate is lower since most women who live in urban areas are exposed to education, so it encourages lower fertility rates. Nigeria has a high birth rate due to family labor for farming contributes to maintaining a large family size.

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The total dependency load for Canada is 34.3% because people want to focus on their work and they don't have a time for a family. People are sometimes stressed when they are career focused and have a baby. The total dependency load for Japan is 41.2% it's so high due to the females wanting to work in the work force and other females follow it. The total dependency load for Nigeria is 46% because most of the population is children that are dependent on the working population.