Prevalence 101
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Questions and Answers

Which study design is suitable for studying rare diseases or diseases with long latency periods?

  • Case-control study (correct)
  • Cross-sectional study
  • Randomized controlled trial
  • Cohort study

    • What is the measure of association used in case-control studies?

  • Prevalence rate
  • Incidence rate
  • Odds ratio (OR) (correct)
  • Relative risk (RR)

    • What is the main advantage of randomized controlled trials (RCTs) compared to observational studies?

  • Less expensive and time-consuming
  • Can study multiple outcomes
  • Less susceptible to bias
  • Can establish causality (correct)

    • In epidemiology, what does temporality refer to?

    <p>The cause preceding the effect in time</p> Signup and view all the answers

    Which of the following formulas is used to calculate the Prevalence Ratio of Disease or Exposure (PeR)?

    <p>PeR = (Prevalence in exposed group) / (Prevalence in unexposed group)</p> Signup and view all the answers

    What is the definition of epidemiology?

    <p>The study of the distribution and determinants of health-related states or events in populations and the application of this study to the prevention and control of health problems</p> Signup and view all the answers

    What is the interpretation of the 95% Confidence Interval (CI) for PeR?

    <p>If the 95% CI includes 1, there is no significant difference between the exposed and unexposed groups.</p> Signup and view all the answers

    Which of the following formulas is used to calculate the Odds Ratio (OR)?

    <p>OR = (a/b / c/d)</p> Signup and view all the answers

    Which formula is used to calculate sensitivity?

    <p>Sensitivity = (True Positives) / (True Positives + False Negatives)</p> Signup and view all the answers

    Which formula is used to calculate specificity?

    <p>Specificity = (True Negatives) / (True Negatives + False Positives)</p> Signup and view all the answers

    What does PPV stand for?

    <p>Positive Predictive Value</p> Signup and view all the answers

    What does NPV stand for?

    <p>Negative Predictive Value</p> Signup and view all the answers

    What does the Kappa statistic measure?

    <p>Agreement between two raters or two diagnostic tests</p> Signup and view all the answers

    What is the interpretation of a high overall agreement?

    <p>The raters or tests are consistent in their judgments</p> Signup and view all the answers

    Which type of study design is suitable for studying rare diseases or diseases with long latency periods?

    <p>Case-control study</p> Signup and view all the answers

    What is the measure of association used in cohort studies?

    <p>Relative Risk (RR)</p> Signup and view all the answers

    What is the measure of association used in case-control studies?

    <p>Odds Ratio (OR)</p> Signup and view all the answers

    Which of the following is NOT one of the Bradford Hill Criteria used to assess causality?

    <p>Specificity</p> Signup and view all the answers

    Which criterion of the Bradford Hill Criteria states that the cause must precede the effect in time?

    <p>Temporality</p> Signup and view all the answers

    According to the Bradford Hill Criteria, which criterion states that the causal interpretation should not conflict with known biological theory?

    <p>Biological Plausibility</p> Signup and view all the answers

    Which of the following formulas is used to calculate the Prevalence Ratio of Disease or Exposure (PeR)?

    <p>PeR = (Prevalence in exposed group) / (Prevalence in unexposed group)</p> Signup and view all the answers

    Which of the following formulas is used to calculate the Odds Ratio (OR)?

    <p>OR = (ad / bc)</p> Signup and view all the answers

    Which of the following formulas is used to calculate the Relative Risk (RR)?

    <p>RR = (Risk in exposed group) / (Risk in unexposed group)</p> Signup and view all the answers

    Which formula is used to calculate the Positive Predictive Value (PPV)?

    <p>True Positives / (True Positives + False Negatives)</p> Signup and view all the answers

    What is the interpretation of a low overall agreement?

    <p>There is disagreement between the raters or tests in their judgments.</p> Signup and view all the answers

    What is the formula to calculate the Overall Agreement (%)?

    <p>(Number of Agreeing Ratings / Total Number of Ratings) x 100</p> Signup and view all the answers

    What does the Kappa statistic measure?

    <p>The agreement between two raters or two diagnostic tests.</p> Signup and view all the answers

    What is the formula to calculate the Sensitivity?

    <p>True Positives / (True Positives + False Negatives)</p> Signup and view all the answers

    What is the formula to calculate the Specificity?

    <p>True Negatives / (True Negatives + False Positives)</p> Signup and view all the answers

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