Symptoms of the Flu: An Overview. It's easy to confuse a common cold with flu symptoms. However, cold symptoms are usually milder and don't last as long as the flu symptoms. If you become infected with the flu virus, you will usually feel flu symptoms 1 to 4 days later. It is important to note that you can spread the flu to others before your flu symptoms start and for another 3 to 4 days after your flu symptoms appear. (Click Flu Virus for more information about the flu.).
Definition of Dependency Ratio: The dependency ratio measures the % of dependent people (not of working age) / number of people of working age (economically active). Dependency Ratio =.
It is defined by the occurrence of any of more than 20 opportunistic infections or HIV-related cancers. Age-Dependency Ratio The ratio of persons in the ages defined as dependent (under 15 years and over 64 years) to persons in the ages defined as economically productive (15-64 years) in a population. D -. Death Rate (or crude death rate) The number of deaths per 1,000 population in a given year. Demographic Transition The historical shift of birth and death rates from high to low levels in a population.