A group of researchers is investigating the potential association between a rare autoimmune condition, systemic sclerosis, and prior occupational exposure to silica dust. The researchers identify 50 patients with confirmed systemic sclerosis from a regional rheumatology clinic. They then identify 100 healthy individuals without the disease from a general internal medicine clinic, matching them to the affected patients by age and biological sex. The researchers proceed to review the detailed occupational histories of all 150 participants to look for past silica dust exposure. Based on this scenario, which of the following statements correctly describe this study design? (Select all that apply)
- Participants are enrolled into the study based on their disease statusCevap
- The study design is highly efficient for investigating rare diseasesCevap
- CParticipants are enrolled into the study based on their prior exposure to silica dust
- DThe study allows for the direct calculation of disease incidence
- ERelative risk is the primary statistical measure of association used
Cevap
The study enrolls participants based on their disease status and is highly efficient for investigating rare diseases.
The clinical vignette describes a case-control study. In a case-control study, individuals are specifically selected based on whether they currently have the disease of interest (cases) or do not have the disease (controls). Because the researchers guarantee a set number of diseased individuals at the start of the investigation, this design is exceptionally efficient for studying rare diseases. If a cohort study were used for a rare disease, it would require a massive sample size and a prolonged follow-up period to yield a statistically significant number of affected patients.
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Characteristics of Case-Control Studies