In a densitysampled casecontrol study cases and controls should representative

In a densitysampled casecontrol study cases and

This preview shows page 8 - 10 out of 10 pages.

by the end of follow­up. In a density­sampled case­control study, cases and controls should berepresentative of the person­time contributed by members of the source population, but they do notneed to be representative of everyone with and without the disease respectively (B and C areincorrect) Likewise, in a cumulative incidence sampled case­control study, cases and controls shouldbe representative of the people in the source population, but they do not need to be representative ofeveryone with and without the disease respectively (B and C are incorrect). Consider, for example, ascenario in which you are interested in studying breast cancer. You may choose to restrict to femalecases, even though men can develop breast cancer. Enrolling only women is valid, so long as thesource population from which they are drawn consists only of women. D is incorrect because controlsare sampled precisely because they do not have the outcome of interest at the time they are selectedas a control. 1 / 1 ptsQuestion 7You are conducting a case­control study investigating whether time of day is associated with the incidence ofbacterial infections as a complication of surgical procedures among patients who underwent an operationperformed at a particular hospital. Would this study involve a primary or secondary study base? Correct! Correct!
Image of page 8
9/15/2018 Quiz 2 – DAGs / Case-control design: EPI 201: Introduction to Epidemiology: Methods I 9/10 1 / 1 ptsQuestion 8Suppose the 4 people listed below are participants in a previously established cohort. You wish to conduct acase­cohort study using this population. Which subject has the greatest chance of being selected for yoursubcohort?
Image of page 9
9/15/2018 Quiz 2 – DAGs / Case-control design: EPI 201: Introduction to Epidemiology: Methods I 10/10 Correct! Correct! Quiz Score: 8 out of 8
Image of page 10

You've reached the end of your free preview.

Want to read all 10 pages?

  • Fall '18
  • Diabetes, representative, 10th Marine Regiment, case-control design

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture