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17 Cards in this Set
- Front
- Back
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What is the definition of Sensitivity?
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Proportion of people who test positive compared to the number of people who actually have it
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What is the equation for Sensitivity?
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TP / (TP+FN)
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What are the two mnemonics for Sensitivity?
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PID = positive in disease
SNOUT = SeNsitivity rules OUT |
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What is the definition of Specificity?
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Proportion of people who test negative compared to the number of people who actually are negative
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What is the equation for Specificity?
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TN / (TN+FP)
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What are the two mnemonics for Specificity?
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NIH = Negative in Health
SPIN = SPecificity rules IN |
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Which biostats value is a screening test looking for compared to a diagnostic test?
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Screening = Sensitivity (Pos)
Diagnostic = Specificity (Neg) |
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Do Sensitivity/Specificity use the vertical or horizontal numbers on the 2x2 table?
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Vertical
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What is a Positive Predictive Value test?
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Proportion of true positives compared to the total number of positives
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What is the equation for PPV?
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TP / (TP+FP)
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What is a Negative Predictive Value test?
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Proportion of true negatives compared to the total number of negatives
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What is the equation for NPV?
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TN / (TN+FN)
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Do PPV and NPV use the vertical or horizontal numbers on the 2x2 table?
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Horizontal
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Define incidence
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Number of new incidents of disease over some time period
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What is the equation for incidence?
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Incidence rate = # of new cases in a specific time period / population at risk during specific time period
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Define prevalence
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Number of all cases at the current time
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What is the equation for prevalence?
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Prevalence = # of existing cases / population at risk
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