# BioStats

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 Author: dakine619 ID: 280488 Filename: BioStats Updated: 2014-08-10 23:26:56 Tags: BioStats Folders: BioStats Description: Step 2 Show Answers:

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1. Prob that screening test is (+) for Pt with Dz?
• Ans: Sensitivity
• Eq: A / (A+C)
2. Prob that Pt w (-) test, doesn't have Dz?
• Ans: Negative Predictive Value (NPV)
• Eq: D / (C+D)
3. Prob that a test will be (-) in Pt w/o Dz?
• Ans: Specificity
• Eq: D / (B+D)
4. Prob that a test(+) Pt actually has the Dz?
• Ans: Positive Predictive Value (PPV)
• Eq: A / (A+B)
5. 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)
6. Describe the frequency of an event
• Incidence:
• Prevalence:
• Person-years:
7. Terms describing magnitude of an effect
• Relative risk:
• odds ratio:
• Absolute risk:
• Number needed to treat:
8. Terms describing Quality of Meas
• Reliability:
• Validity:
9. Measures of diagnostic test performance
• Sensitivity:
• Specificity:
• Predictive Values:
• Likelihood ratio:
• Accuracy:
10. Expressions used when making inferences about data
• Confidence interval:
• Credible interval:
• Errors:
• Powers:
11. Study Designs
• Cohort Study:
• Case-Control Study:
• Randomized controlled trial (intention to treat):
• Mendelian randomization:

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