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A methodological note on the selection of friends as controls
1Department of Clinical Epidemiology, Chaim Sheba Medical Center, and the Stanley Steyer Institute for Cancer Epidemiology and Research, Tel Aviv University, Tel Hashomer, Israel.
International Journal of Epidemiology
|October 3, 1998
Summary
Selecting friends as controls in case-control studies presents challenges, as interviewee preselection is common. Careful consideration of control group suitability is crucial for valid study results.
Area of Science:
- Epidemiology
- Medical Research Methodology
Background:
- Case-control studies are essential for investigating disease etiology.
- The selection of appropriate control groups is critical for study validity.
- Previous studies have utilized various control groups, including hospital-based and community controls.
Purpose of the Study:
- To illustrate inherent issues in selecting friends as controls in case-control studies.
- To highlight the impact of interviewee preselection on control group characteristics.
- To emphasize the need for control group selection to align with study hypotheses.
Main Methods:
- Analysis of a recent dietary study employing both hospital and friend controls.
- Examination of control selection biases in case-control research.
- Discussion of the advantages and disadvantages of different potential control groups.
Main Results:
- Interviewee preselection of control characteristics is a significant and often unavoidable issue.
- Friend controls may introduce biases not present in other control groups.
- The choice of controls directly influences the interpretation of study findings.
Conclusions:
- The selection of controls in case-control studies requires careful consideration of potential biases.
- Control groups must be chosen to match the specific hypothesis being tested.
- A thorough evaluation of the pros and cons of each control group is necessary for robust epidemiological research.