What was the hypothesis of the study?
How were the cases defined for the study?
How many cases were selected for the study?
How were the controls defined and selected for the study?
How many controls were selected for the study
Describe the inclusion or exclusion criteria for the selection of cases and controls?
What was/were the exposure of interest?
Where and how the information on exposure was obtained by the researchers?
How many participants had positive history of exposure among cases and controls?
What measure of association was used to describe the relationship between the disease and exposure?