Cohort Studies. Introduction. All studies involve some descriptive or analytic type of comparison of exposure and disease status. Analytical study design options include: observational or interventional (which one is based on the role of the investigator) .
Major problem with a prospective cohort design is that the cohort must be followed up for a long period of time.
Your assignment: Describe and differentiate between these types of biases.
Survival curves and risk of death for males vs. females based on life tables in California for 1980.
To be continued…