Biostatistics & Research · single question
A study follows two groups (one exposed, one unexposed) FORWARD in time to compare the incidence of an outcome. This design is a:
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Correct answer: A. Cohort study
- A. Correct. Following exposed vs unexposed groups forward in time to measure outcome incidence defines a (prospective) cohort study; it can yield relative risk.
- B. A case-control study starts with the outcome (cases vs controls) and looks BACKWARD for exposure.
- C. A cross-sectional study measures exposure and outcome at one point in time (prevalence).
- D. An RCT involves random ALLOCATION of the intervention by the investigator, not just observation of an existing exposure.
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