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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 casecontrol studies
 Eq: (A/C)/(B/D) or (A*D)/(B*C)

Describe the frequency of an event
 Incidence:
 Prevalence:
 Personyears:

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
 Sensitivity:
 Specificity:
 Predictive Values:
 Likelihood ratio:
 Accuracy:

Expressions used when making inferences about data
 Confidence interval:
 Credible interval:
 Errors:
 Powers:

Study Designs
 Cohort Study:
 CaseControl Study:
 Randomized controlled trial (intention to treat):
 Mendelian randomization:

