Introduction to Epidemiology 131

Assignment title or task:

Q1: Describe the study population in a cohort study and explain why follow-up over time is essential in this study design. (1 points)

Q2: Explain the difference between a prospective and a retrospective cohort study. Provide one advantage of a prospective cohort study. (1 points)

Q3: List one strength and one limitation of cohort studies. (2 points)

Q4: If a cohort study finds a Relative Risk (RR) of 1.0 for the association between an exposure and a disease, what does this result mean? (1 points)

Q5: Identify one potential confounder in a cohort study examining the relationship between drinking coffee and lung cancer. (1 points)

Q6: A cohort study is conducted to examine the association between exposure to air pollution and the development of asthma. The data are shown in the 22 table below:

Use the data to calculate:

1. The incidence of Asthma in the exposed group? (1 points)

2. The incidence of Asthma in the unexposed group? (1 points)

3. Calculate the Relative Risk (RR) (1 points)

4. Interpret the RR. (1 points)