Q1: A case-control study was conducted to determine if the relationship between cigarette smoking and lung cancer modified by the presence of asbestos exposure. The odds ratio for lung cancer among smokers was 10.0. The data were stratified among those exposed to asbestos or not. The odds ratio for lung cancer among smokers who were also exposed to asbestos was 50.0. The odds ratio for lung cancer among non-smokers who were exposed to asbestos 5.0, and the odds ratio for lung cancer among those who did not smoke and were not exposed to asbestos was 1.0. Asbestosis an effect modifier of the relation between smoking and lung cancer.

a-True

b-False

Q2: A study design method to control confounding involving the selection of study subjects so that potential confounders are distributed identically is called:

a-Multivariate modeling

b-Stratification

c-Matching

d-Restriction

Q3: An analytic method that simultaneously adjusts for several variables (confounders) is called:

a-Multivariate modeling

b-Stratification

c-Matching

d-restriction