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11 Cards in this Set
- Front
- Back
Define Prevalence
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The number of people affected by a disease in a given population at a specific time. It includes both old and new cases.
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Prevalence equation per 1000 ppl
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(# cases in populace at a point in time/#of people in population) x 1000
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Point Prevalence
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Prevalence of a disease at a given point in time. Often referred to as "prevelance".
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Period Prevalence
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Prevalence of a disease in a given period of time
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Incidence
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# of new cases of a disease that occur in a given period of time in a given population. This is a measure of risk
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Incidence per 1000 ppl
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(# new cases in an at risk population /#of people in at risk population) x 1000
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What is another way to calculate prevalence
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Prevalence = Incidence x Duration
Only if rates are not changing and in-migration equals out-migration. |
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In age restricted mortality, where is age accounted for in the equation?
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In the numerator and denominator.
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Relative Risk Equation
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Relative Risk = Risk in exposed/Risk in unexposed
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What ratio can be used with either kind of observational study?
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Odds ratio= odds a case was exposed/odds a control was exposed (--case study)
Odds ratio = odds an exposed person develops disease/odds an unexposed person develops disease (--cohort study) |
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Why can't relative risk be calculated in case-control studies?
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Because we don't have values for incidence in exposed and unexposed populations.
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