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11 Cards in this Set
- Front
- Back
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What does the PREVALENCE of a disease equal (formula)?
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# ppl w/ disease
----------------------------- total # in population |
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Is prevalence an estimate of the risk of developing a disease?
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NO
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What is a point prevalence?
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# ppl w/ disease
--------------------------- total # ppl in population - AT a specified POINT in time - In a specific population |
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What is period prevalence?
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# ppl w/ disease
------------------------------ total # ppl in population - OVER a specified PERIOD of time - In a specific population |
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What are the ranges for prevalence?
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0-1, because ratio of total population
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What is the cumulative incidence of disease?
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# of new cases of disease
------------------------------------------- # of individuals at risk of disease in population numerator = all new cases during period of time denominator = all at risk individuals in the population at the start of the specified period of time |
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What is the range of cumulative incidence?
In words, what does cumulative incidence mean |
0-1
- Measure of the risk of developing the disease - Percentage of at risk individuals who developed the disease |
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What is the incidence RATE?
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# of new cases of disease
----------------------------------------- Sum of "at risk time" of all individuals in population (in person-time) |
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What are the units of incidence rate?
Range? |
Units: Person-Time
Range: 0 - infinity |
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Is incidence rate a measure of risk and/or probability?
Cumulative incidence? |
Incidence rate: Neither
Cumulative Incidence: Risk and probability |
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In the water tank analogy what is incidence and what is prevalence?
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Incidence = water flowing into the tank
Prevelance = water level in tank Death/Recovery = water leaving tank |
