Understanding Risk and Incidence Proportion Calculation
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Questions and Answers

What assumptions are made when calculating risk (incidence proportion) and incidence odds?

  • Open population with competing risks
  • Closed population with competing risks
  • Open population without competing risks
  • Closed population without competing risks (correct)

    • Which term is used to describe the frequency of new disease events or outcomes occurring in a given follow-up period?

  • Incidence Rate (correct)
  • Risk Ratio
  • Prevalence Rate
  • Odds Ratio

    • What does person-time at risk refer to in data analysis?

  • The time each person is followed up in a cohort study
  • The total time of follow-up for all persons in the study population (correct)
  • The time elapsed since the last event occurred
  • The time taken to calculate the odds ratio

    • Which of the following is another name for incidence density?

    <p>Outcome Density</p> Signup and view all the answers

    What happens to the risk assumptions with longer periods of follow-up in cohort studies?

    <p>They tend to be violated</p> Signup and view all the answers

    What is the definition of risk or incidence proportion?

    <p>The proportion of persons at risk in a population who develop the disease or outcome during a specific time period</p> Signup and view all the answers

    What does risk range from in terms of values?

    <p>0 to 1</p> Signup and view all the answers

    What does risk represent in terms of probability?

    <p>The average probability that a person in the population will develop the disease or outcome over a given period of time</p> Signup and view all the answers

    In what unit is risk measured?

    <p>Dimensionless (no units)</p> Signup and view all the answers

    What is the calculation for incidence proportion if A represents the number of new cases of disease or outcomes during ∆t and N0 represents the number of persons at risk at the start of the time period?

    <p>(A / N0)</p> Signup and view all the answers

    What does it mean when risk is a function of events over time?

    <p>The risk can increase or decrease as events unfold over a period of time</p> Signup and view all the answers

    What is the Risk Difference (RD) in the first practice problem?

    <p>0.15</p> Signup and view all the answers

    In the first practice problem, what does a Risk Ratio (RR) of 2.0 indicate?

    <p>The one-year risk among the exposed is 2 times the one-year risk among the unexposed.</p> Signup and view all the answers

    What does an Incidence Rate Difference (IRD) of 0 indicate?

    <p>No difference in incidence rates between exposed and unexposed individuals.</p> Signup and view all the answers

    What range does the Incidence Rate Ratio (IRR) cover?

    <p>0 to ∞</p> Signup and view all the answers

    How is the Risk Difference (RD) interpreted in practice problem #4?

    <p>Difference in risk between exposed and unexposed groups.</p> Signup and view all the answers

    What is the interpretation of the Risk Ratio (RR) in practice problem #4?

    <p>Risk among exposed is 2 times risk among unexposed.</p> Signup and view all the answers

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