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Crossover trials with a binary response: a powerful method despite the carryover effect
1Department of Medicine, Merwede Hospital Dordrecht, The Netherlands.
Journal of Clinical Pharmacology
|March 1, 1996
Summary
Two-period crossover trials effectively compare treatments by minimizing patient variability. This study confirms their power for binary outcomes, even with carryover effects, making them robust for drug screening.
Area of Science:
- Biostatistics
- Clinical Trial Design
- Pharmacometrics
Background:
- Two-period crossover trials offer advantages by utilizing within-patient comparisons, reducing the impact of between-patient variability.
- A key assumption is that treatment order does not significantly affect outcomes, a factor previously unexamined for binary responses in crossover studies.
Purpose of the Study:
- To investigate the impact of order effects (carryover effects) on the statistical power of two-period crossover trials with binary outcomes.
- To assess the robustness of crossover designs for binary responses despite potential carryover effects.
Main Methods:
- Utilized a mathematical model grounded in standard statistical tests.
- Simulated and analyzed scenarios with varying degrees of carryover effects in binary response crossover trials.
Main Results:
- Demonstrated that crossover studies with binary responses maintain significant power even with substantial carryover effects.
- Identified that testing for carryover effects is most valuable when the null hypothesis of no treatment effect is not rejected.
Conclusions:
- Two-period crossover trials with binary outcomes are powerful and reliable, even when carryover effects are present.
- Carryover effect testing in these designs should be conditional on the primary treatment effect analysis.