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13 Cards in this Set
- Front
- Back
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The number of ALL cases in a given time period
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Prevalence
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The number of new cases in a given time
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Incidence
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subset of population at risk
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target population
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Way to find out which people in a population have a disease compared to those who do not.
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Screening
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Number of truly diseased people who test positive for the disease
=(True Positives)/(True Positive + False Negative) |
Sensitivity
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Number of truly non-diseased people who test negative for the disease
=(True Negatives)/(False Positive + True Negative) |
Specificty
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Probability that a person with a positive test is a true positive
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Positive predicted value
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Probability that a person with a negative test is a true negative
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Negative predicted value
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Association between exposure to a particular factor and risk of a certain outcome
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Relative risk
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Relative Risk Ration (RRR)
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Incidence rate among exposed/incidence rate among unexposed
=A/C True Positive/False Negative |
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The difference between the incidence rate among the exposed and the incidence rate among the unexposed
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Absolute Risk Reduction (ARR)
Attributable risk reduction ARR = (A-C)/A+C |
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Numbers Needed to Treat NNT
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NNT = 1/ARR
Ie: average number of patients that a doc would need to treat in order to prevent outcome. |
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Reanalysis and statistically cross-references multiple studies
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Meta-analysis
Gives significance to studies that couldn't stand alone on their own merits Critics say try to correlate apples and oranges. |
