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Difficulty: HardStudy Design

Match each clinical research scenario with its most appropriate epidemiological study design.

  • Comparing the efficacy of two inhaled corticosteroids for stable asthma, where participants receive one drug, complete a washout period, and then receive the alternative drug.Randomized crossover trial
  • Investigating immediate triggers (e.g., heavy exertion) of acute myocardial infarction by comparing exposures in the hours immediately preceding the event to the patient's own earlier baseline periods.Case-crossover study
  • Evaluating a community-wide educational intervention on childhood obesity by randomly assigning entire school districts, rather than individual students, to the intervention or control group.Cluster randomized trial
  • Determining if prior use of a newly withdrawn over-the-counter supplement is associated with the development of a very rare form of drug-induced liver injury.Case-control study
  • Determining the long-term incidence of mesothelioma by identifying a group of individuals based on 1980-1990 shipyard employment records and tracking their subsequent health outcomes to the present day.Retrospective cohort study

Answer

Scenario 1 matches with Randomized crossover trial; Scenario 2 matches with Case-crossover study; Scenario 3 matches with Cluster randomized trial; Scenario 4 matches with Case-control study; Scenario 5 matches with Retrospective cohort study.
Each research scenario contains specific constraints or goals that dictate an optimal study design: evaluating sequential treatments requires a randomized crossover trial; studying acute triggers uses a case-crossover design; group-level interventions require cluster randomization; rare diseases necessitate case-control studies; and using historical records to track incidence based on an exposure defines a retrospective cohort study.

Step-by-Step Solution

1
Analyze the asthma medication scenario.
The scenario describes sequential administration of treatments with a washout period.
This structural characteristic is the defining feature of a randomized crossover trial.
2
Analyze the acute myocardial infarction triggers scenario.
The scenario involves an acute event and compares immediate prior exposures to the patient's own historical baseline.
This within-subject comparison for acute triggers characterizes a case-crossover study.
3
Analyze the community-wide educational intervention scenario.
The randomization occurs at the group level (school districts) rather than the individual level.
Group-level randomization defines a cluster randomized trial, which is often used to prevent treatment contamination across subjects in the same environment.
4
Analyze the rare liver injury scenario.
The outcome is a very rare disease, requiring an efficient design to find enough cases without requiring a massive cohort.
A case-control study is optimal for rare outcomes because it starts by identifying cases and comparing their past exposures to controls.
5
Analyze the shipyard employment scenario.
Exposure is defined historically (1980-1990 records), and the cohort is tracked forward to measure outcome incidence.
Using historical data to define a cohort by exposure and measuring subsequent disease incidence is the definition of a retrospective cohort study.

Key Concept

Selection of epidemiological study designs based on research parameters such as exposure duration, outcome rarity, and unit of randomization.
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Study Design

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