Slide 1Cohort, case-control & cross- sectional studies Source: Alain Moren, EPIET Introductory courses Kostas Danis EPIET Introductory course Menorca, Spain 16/9-12/10/2012…

Slide 1 Slide 2 Epidemiological studies Two types Observation Experiment Slide 3 Exposed Not exposed Disease occurrence Unethical to perform experiments on people if exposure…

Slide 1 Main points to be covered Rate ratios Relationship between the type of ratio measure of association and study design How the odds ratio estimates other ratio measures…

Slide 1 Main points to be covered Measures of association in case-control studies Prevalent controls design: odds ratio vs. relative risk and the rare disease assumption…

Slide 1 Cohort study Slide 2 What is a cohort? One of 10 divisions of a Roman legion Group of individuals – sharing same experience – followed up for specified period…