PASS Case Control Study

Question 1

What is a case control study?

Answer 1

Cases are selected, then controls are selected to each case

Case - those with event + outcome
Control - those with no event or outcome

Question 2

Advantages of case control studies

Answer 2

Inexpensive
Efficient when even is rare or conditions take long time to develop
Smaller sample size
Allows studying multiple exposures

Question 3

Disadvantages of case control studies

Answer 3

Cannot determine incidence + prevalence
Not suitable for rare exposures
Selection bias

Question 4

When does research start in case control studies?

Answer 4

After exposure + event occurrence

Question 5

How is a case control study conducted?

Answer 5

Select cases then controls are matched