![]() ![]() You would assess whether or not each subject has been exposed to high levels of EMF. ![]() To perform a cross-sectional study of the EMF-leukemia link, you would need to study a large sample of people selected from the general population. As an example, let's consider how to conduct a cross-sectional study of the link between electromagnetic fields (EMF) and leukemia. In a cross-sectional study, you recruit a single group of subjects and then classify them by two criteria (row and column).artery obstructed).Ĭontingency tables display data from these five kinds of studies: ![]() Contingency tables summarize results where you compared two or more groups and the outcome is a categorical variable (such as disease vs. ![]()
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