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12 Cards in this Set
- Front
- Back
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proportion
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- expression of probability in which the numerator is derived from the denominator
- Prevalance - Case Fatality |
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prevalance
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the probability that disease is present at a particular point in time
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true rate
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- a proportion which includes a period of time
- Incidence rate |
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Incidence
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the rate of the development of dease over the period of a year
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3 Rates to describe the epidemiology of disease
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1.) Incidence
2.) Prevalance 3.) Case Fatality |
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case fatality
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the probability of dying once the disease has developed
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mortality rate
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- the incidence of death per 100,000 people per year
= incidence rate x case fatality |
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Determining Prevalance =
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= incidence rate x average duration of disease
ex. avg duration = 30 yrs, incidence = 10/1000.000 per year...prevalance = 300/100,000 |
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Determining Incidence =
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= prevalance/average duration
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Comparing rates
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1.) Subtraction
2.) Rate ratio |
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Substraction
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ex. 10/1000 per year minus 6/1000 per year = 4/1000 per year
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Rate ratio
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- relative probability of events in one population to another
- this population comparison is a group association and is not capable of establishing an association at the individual level ex. prev of pop A = 20/1,000, prev of pop B = 10/1,000, rate ratio = 20/10 = 2, prevlance is 2x greater in pop A than pop B |
