A condensed rapid review pass over the highest yield biostatistics and epidemiology formulas and study design facts for final week review.
40 cards · mixed cards · AI-written, checked twice. Edit anything.
- What is the formula for sensitivity?
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True positives / (True positives + False negatives)- What is the formula for specificity?
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True negatives / (True negatives + False positives)- What is the formula for positive predictive value (PPV)?
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True positives / (True positives + False positives)- What is the formula for negative predictive value (NPV)?
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True negatives / (True negatives + False negatives)- As disease prevalence increases, positive predictive value ____.
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increases- As disease prevalence increases, negative predictive value ____.
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decreases- Do sensitivity and specificity change with disease prevalence?
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No, they are intrinsic properties of the test itself- What is the formula for the positive likelihood ratio?
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Sensitivity / (1 - Specificity)- What is the formula for the negative likelihood ratio?
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(1 - Sensitivity) / Specificity- What does the mnemonic SnNout mean?
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A highly sensitive test, when negative, rules out disease- What does the mnemonic SpPin mean?
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A highly specific test, when positive, rules in disease- In which study design is the odds ratio the appropriate measure of association?
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Case-control studies- In which study design is relative risk the appropriate measure of association?
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Cohort studies- What is the formula for relative risk reduction (RRR)?
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(Risk in unexposed - Risk in exposed) / Risk in unexposed- What is the formula for absolute risk reduction (ARR)?
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Risk in unexposed (control) group minus risk in exposed (treatment) group
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