Incidence:
Definition:
Incidence rate:
Elements of incidence rate:
Reasons for change in incidence:
Uses of incidence:

Prevalence:
Definition:
Types:
Elements of prevalence:
Reasons for change:
Uses:

Ecologic studies:
What:
Why:
Outcome measure:
Advantages:
Disadvantages:

Correlation studies:
What:
Why:
Advantages:
Disadvantages:

Case-control studies:
What:
Why:
Outcome measure:
Advantages:
Disadvantages:

Cohort studies:
What:
Prospective cohort:
Retrospective/historic:
Why:
Outcome measure:
Advantages:
Disadvantages: