The survival and eventual return of juvenile Snake River salmon and steelhead to spawning streams as adults depends more on their size than the way they pass through hydroelectric dams on their migration to the ocean, new ...
Ecology
Nov 25, 2019
0
4
A new study led by University of Toronto public health researchers suggests rising short-term mortality rates among white Americans "seems driven principally by anxiety among whites about losing social status," even though ...
Social Sciences
Nov 25, 2019
4
161
In a little less than three weeks, red tide bloom intensified greatly along Florida's west coast, according to the Florida Fish and Wildlife Conservation Commission's Wednesday report.
Environment
Nov 21, 2019
0
30
What's the purpose of a business? For a long time, the textbook answer to that question has been purely "to make as much money as possible for its shareholders." But business leaders—who often themselves get huge payouts ...
Economics & Business
Oct 10, 2019
0
10
An international team headed by Óscar Llorca at the Spanish National Cancer Research Centre (CNIO), and the group led by Sebastian Geibel at the University of Würzburg (Germany), report an accurate 3-D model of the mechanism ...
Biochemistry
Oct 09, 2019
0
43
The work of a Montana State University professor examining the economic impacts of colony collapse disorder among commercial honeybees was published in the Journal of the Association of Environmental and Resource Economists ...
Ecology
Oct 04, 2019
0
10
How did people look after their children in the Stone Age? It turns out that prehistoric parents may not have been so different to modern mums and dads. Clay vessels that have been found in Germany could have been used to ...
Archaeology & Fossils
Sep 26, 2019
0
144
Researchers at the University of Bradford have shown a link between the diet of Roman Britons and their mortality rates for the first time, overturning a previously-held belief about the quality of the Roman diet.
Archaeology & Fossils
Sep 10, 2019
0
149
Cold temperatures are not nearly as deadly as heat, with around 2% of all deaths in Australia related to heat, according to new research from the University of Technology Sydney.
Environment
Sep 10, 2019
2
13
A team of researchers from Purdue University and the U.S. Department of Agriculture has found that trees in the United States are facing devastating threats due to invasive species. In their paper published in Proceedings ...
Mortality rate is a measure of the number of deaths (in general, or due to a specific cause) in some population, scaled to the size of that population, per unit time. Mortality rate is typically expressed in units of deaths per 1000 individuals per year; thus, a mortality rate of 9.5 in a population of 100,000 would mean 950 deaths per year in that entire population. It is distinct from morbidity rate, which refers to the number of individuals in poor health during a given time period (the prevalence rate) or the number who currently have that disease (the incidence rate), scaled to the size of the population.
One distinguishes:
In regard to the success or failure of medical treatment or procedures, one would also distinguish:
Note that the crude death rate as defined above and applied to a whole population can give a misleading impression. The crude death rate depends on the age (and gender) specific mortality rates and the age (and gender) distribution of the population. The number of deaths per 1000 people can be higher for developed nations than in less-developed countries, despite life expectancy being higher in developed countries due to standards of health being better. This happens because developed countries typically have a completely different population age distribution, with a much higher proportion of older people, due to both lower recent birth rates and lower mortality rates. A more complete picture of mortality is given by a life table which shows the mortality rate separately for each age. A life table is necessary to give a good estimate of life expectancy.
This text uses material from Wikipedia, licensed under CC BY-SA
