Selecting a Study Design. Goals. Describe the cohort study design. Describe the case-control study design. Compare situations in which cohort and case-control study designs should be used. About Analytic Studies. We can use analytic studies to test hypotheses. We want to know:
If fewer than 200 people involved, should consider interviewing everyone.Case-Control or Cohort: Which one is right?
Figure 1: Easily identifiable cohort (e.g., church picnic, wedding, luncheon)
Total N = 115
Or capture entire cohort using e-mail or mail surveys.
Or identify cohorts within the larger cohort (e.g., a single dormatory on a college campus).Case-Control or Cohort: Which one is right?
Figure 2: Easily identifiable but large cohort (e.g., cruise ship, college campus)
Total N = 2375
Figure 3: Selecting controls for a rare disease in a large cohort: case-control design and efficient selection of controls.
Hispanic residents in a county
Female Hispanic residents in a county
Female Hispanic residents of child-bearing age in a county
Pregnant Hispanic residents in a county
12 cases of listeriosis among pregnant Hispanic women