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Related Experiment Videos

The AB/BA crossover: past, present and future?

S Senn1

  • 1CIBA-GEIGY Ltd, Medicines and Clinical Development Department, Basle, Switzerland.

Statistical Methods in Medical Research
|December 1, 1994
PubMed
Summary
This summary is machine-generated.

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The AB/BA crossover design requires careful consideration of carry-over effects. Analysis of AB/BA trials with baseline data is unreliable, emphasizing the need for adequate washout periods and cautious interpretation of results.

Area of Science:

  • Biostatistics
  • Clinical Trial Design

Background:

  • The AB/BA crossover design is a widely used method in clinical research.
  • Carry-over effects, where the effect of one treatment persists into the next period, pose a significant challenge in crossover trials.

Purpose of the Study:

  • To provide a historical review of the AB/BA crossover design.
  • To critically evaluate methods for addressing carry-over effects.
  • To examine the utility of baseline data in AB/BA designs.

Main Methods:

  • Historical perspective and critical review of statistical approaches.
  • Analysis of the two-stage procedure for handling carry-over.
  • Evaluation of AB/BA designs incorporating baseline measurements.

Main Results:

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  • The traditional two-stage procedure for managing carry-over effects in AB/BA designs is demonstrated to be unsafe.
  • Baseline data does not effectively mitigate the problem of carry-over effects.
  • Analysis of AB/BA designs is inherently dependent on assumptions about carry-over.

Conclusions:

  • Rational analysis of AB/BA trials necessitates explicit assumptions about carry-over.
  • Adequate washout periods are crucial for minimizing carry-over effects.
  • Techniques such as analysis of covariance may be beneficial under specific circumstances, but careful consideration of carry-over remains paramount.