Epidemiology - Quantifying disease in populations, what is a case
- Created by: une-meduse
- Created on: 11-05-14 17:37
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- Quantifying Disease in Populations
- Incidence
- The rate at which new cases occur in a population during a specified period
- Measured as: (population at risk) x (time during which cases were ascertained)
- The rate at which new cases occur in a population during a specified period
- Prevalence
- Is the proportion of a population that are cases at a point in time
- Mortality
- The incidence of death from a disease
- Definition of a Case
- Purpose must be defined before a case may be defined, as each definition is suitable for a different purpose
- Statistical Definition
- Normal is defines as being within two standard deviations of the age specific mean, as in conventional lab practice
- Clinical Definition
- Defined by the level of a variable above which symptoms and complications become more frequent
- Prognostic Definition
- There will sometimes be a threshold value below which level and prognosis are unrelated
- Operational Definition
- Definition will be based on the threshold for treatment, which takes into account symptoms and prognosis but is not determined consistently by either
- Statistical Definition
- Purpose must be defined before a case may be defined, as each definition is suitable for a different purpose
- Incidence
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