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Related Experiment Videos

Should we use a case-crossover design?

M Maclure1, M A Mittleman

  • 1Epidemiology Department, Harvard School of Public Health, Boston, Massachusetts 02115, USA. malcolm.maclure@moh.hnet.bc.ca

Annual Review of Public Health
|July 8, 2000
PubMed
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The case-crossover study design is best for sudden outcomes and exposures. This review helps researchers understand its nuances for better study proposals and risk estimation.

Area of Science:

  • Epidemiology
  • Biostatistics

Background:

  • The case-crossover design is effective for studying acute exposures and abrupt outcomes.
  • Its application has expanded to include gradual effects and insidious onsets, requiring methodological adaptation.
  • Understanding its core principles is crucial for accurate relative risk estimation.

Purpose of the Study:

  • To review the first decade of case-crossover study applications.
  • To guide researchers in developing robust study proposals.
  • To elucidate key concepts like triggers, deterrents, and exposure windows.

Main Methods:

  • Review of published case-crossover studies.
  • Comparison of exposure frequency during case-specific control periods.
  • Analysis of confounding factors controlled by the design.

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Main Results:

  • The design's strengths lie in intermittent exposures and immediate, transient effects.
  • Adaptations are needed for gradual effects and insidious outcomes.
  • The method controls for time-invariant confounders effectively.

Conclusions:

  • Case-crossover studies offer a powerful tool for etiological research when applied appropriately.
  • Careful consideration of exposure windows, induction, and effect periods is essential.
  • This review provides a framework for optimizing future case-crossover study designs.