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Definitions (165)
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droplet nuclei
The residue of dried droplets that may remain suspended in the air for long periods, may be blown over great distances, and are easily inhaled into the lungs and exhaled.
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age-adjusted mortality rate
A mortality rate statistically modified to eliminate the effect of different age distributions in the different populations.
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agent
A factor, such as a microorganism, chemical substance, or form of radiation, whose presence, excessive presence, or (in deficiency diseases) relative absence is essential for the occurrence of a disea [..]
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age-specific mortality rate
A mortality rate limited to a particular age group. The numerator is the number of deaths in that age group; the denominator is the number of persons in that age group in the population.
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analytic epidemiology
The aspect of epidemiology concerned with the search for health-related causes and effects. Uses comparison groups, which provide baseline data, to quantify the association between exposures and outco [..]
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analytic study
A comparative study intended to identify and quantify associations, test hypotheses, and identify causes. Two common types are cohort study and case-control study.
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applied epidemiology
The application or practice of epidemiology to address public health issues.
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association
Statistical relationship between two or more events, characteristics, or other variables.
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attack rate
A variant of an incident rate, applied to a narrowly defined population observed for a limited period of time, such as during an epidemic.
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attributable proportion
A measure of the public health impact of a causative factor; proportion of a disease in a group that is exposed to a particular factor which can be attributed to their exposure to that factor.
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