Question
You decide to conduct a study looking at whether smoking is a risk factor for age-related macular degeneration (ARMD). You identify a similar demographic group of patients with ARMD and those without ARMD and then determine their smoking history. What type of study does this scenario best describe?
| A. |
Cohort study |
| B. |
Single-masked study |
| C. |
Case-controlled study |
| D. |
Double-blind study |
Show Answer
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Correct Answer � C Explanation |
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Answer:C) Case-controlled study
Two types of studies exist: retrospective (observational) and prospective (experimental). Within the retrospective, or case-control variety, either a case report or a case series may be employed. In a retrospective study, patients are taken at a single point in time and examined for a variable that occurred prior to the date of examination.