In a study evaluating the effects of compression stockings on chronic venous insufficiency, what type of study design is being employed?

• A. Case-control study
• B. Case series study
• C. Clinical trial
• D. Cohort study

Answer: (D)

In this scenario, the study evaluating the effects of compression stockings on chronic venous insufficiency is a clinical trial. A clinical trial is characterized by an intervention being tested, in this case, the application of compression stockings. Researchers would typically randomly assign subjects to receive either the compression stockings or a control treatment, allowing for the comparison of outcomes between the two groups.

Such a design helps establish a cause-and-effect relationship because it actively intervenes by applying the treatment and measuring the outcomes relative to a control. The goal in this context is to determine how effective compression stockings are in managing the symptoms of chronic venous insufficiency compared to no intervention or a different therapeutic approach.

In contrast, other study designs such as case-control and cohort studies do not involve direct intervention. A case-control study typically identifies participants based on an outcome and looks back at their exposure status, while a cohort study follows a group over time to see who develops the outcome based on their exposure status. A case series, on the other hand, describes a group of patients with a particular condition without a control group and does not assess the effects of an intervention on outcomes. Therefore, these designs would not be applicable in actively evaluating the efficacy of compression stockings in this manner.