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Prob that screening test is (+) for Pt with Dz?
- Ans: Sensitivity
- Eq: A / (A+C)
Prob that Pt w (-) test, doesn't have Dz?
- Ans: Negative Predictive Value (NPV)
- Eq: D / (C+D)
Prob that a test will be (-) in Pt w/o Dz?
- Ans: Specificity
- Eq: D / (B+D)
Prob that a test(+) Pt actually has the Dz?
- Ans: Positive Predictive Value (PPV)
- Eq: A / (A+B)
What are the odds of exposure among Pts w a Dz, Vs, odds of exposure among Pt w/o Dz?
- Ans: Odds Ratio (OR)
- unique: Determined through case-control studies
- Eq: (A/C)/(B/D) or (A*D)/(B*C)
Describe the frequency of an event
Terms describing magnitude of an effect
- Relative risk:
- odds ratio:
- Absolute risk:
- Number needed to treat:
Terms describing Quality of Meas
Measures of diagnostic test performance
- Predictive Values:
- Likelihood ratio:
Expressions used when making inferences about data
- Confidence interval:
- Credible interval:
- Cohort Study:
- Case-Control Study:
- Randomized controlled trial (intention to treat):
- Mendelian randomization:
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