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Zero Population Growth
Healthline — Zero population growth occurs when there is neither a net growth nor a net decline in population, but rather a steady state in which the numbers added by annual births and immigration exactly balance the numbers who die and emigrate each year. ...More…
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Youth Risk Behavior Surveillance System
Healthline — The Youth Risk Behavior Surveillance System (YRBSS) is a social epidemiologic surveillance system established by the U.S. Centers for Disease Control and Prevention (CDC) in order to monitor health-risk behaviors among high school students, ...More…
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Yellow Fever
Healthline — Yellow fever is a severe infectious disease, caused by a virus called a "flavivirus." This flavivirus can cause outbreaks of epidemic proportions throughout Africa and tropical America. The first written evidence of such an epidemic occurred in ...More…
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Years of Potential Life Lost (YPLL)
Healthline — The statistic known as "years of potential life lost" (YPLL) is a measure of the relative impact of various diseases and other lethal forces on a population. It is a useful way to draw attention to the loss of expected years of life due to ...More…