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Crossover effects in experimental investigations with human subjects
Pharmacology, Biochemistry, and Behavior
|November 1, 1975
Summary
Simple crossover drug studies can yield misleading results. Factors like reduced volunteer apprehension and medication effects on performance measures can skew outcomes, but methods exist to mitigate these issues.
Area of Science:
- Clinical Research Methodology
- Pharmacology
- Biostatistics
Background:
- Crossover studies are common in drug trials but susceptible to biases.
- Participant apprehension and medication effects can influence repeated measurements.
- Artifactual results may compromise the validity of simple crossover designs.
Purpose of the Study:
- To highlight potential artifacts in simple crossover drug studies.
- To demonstrate how participant factors and medication impact performance.
- To propose solutions for improving the reliability of crossover trial data.
Main Methods:
- Empirical evidence was used to illustrate the problem.
- Analysis focused on performance measures in repeated testing scenarios.
- Methodological suggestions were developed to address identified biases.
Main Results:
- Participant apprehension decreases on subsequent testing occasions.
- Experimental medication demonstrably alters performance measures.
- These factors can lead to artifactual findings in crossover designs.
Conclusions:
- Simple crossover studies require careful design to avoid bias.
- Acknowledging and controlling for participant and drug effects is crucial.
- Implementing proposed adjustments can enhance the accuracy of crossover study results.