SOURCES OF CASES IN AN EPIDEMIOLOGICAL STUDY
Cases in an epidemiological study can be sourced in any of the following ways:
- Data from hospital registries, clinics and disease screening records.
- All cases diagnosed in a particular hospital department at a given time.
- All cases diagnosed in the community/population.
- All cases diagnosed in all hospitals (public or private).
- All cases diagnosed in a sample or fraction of the population/community.
SOURCES OF CONTROLS IN AN EPIDEMIOLOGICAL STUDY
Controls in an epidemiological study can be sourced in any of the following ways:
- Samples of patients who do not have the disease under study in all hospitals.
- Samples from members of the general community/population who are at risk for the disease as the cases.
- Relations, spouses, children or companions of the cases.
- Samples of patients in the same hospital where cases were obtained from and, who do not have the disease.
- Non-cases in a sample of the community/population.
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