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Updated: Jul 2, 2025

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Uncontrolled pain: a call for better study design.

Timothy H Hyndman1,2, Ross S Bowden3, Andrew P Woodward4

  • 1School of Veterinary Medicine, Murdoch University, Murdoch, WA, Australia.

Frontiers in Veterinary Science
|February 29, 2024
PubMed
Summary
This summary is machine-generated.

To improve animal pain research, studies should include both positive and negative control groups. This enhances the reliability of analgesic treatments and benefits animal welfare.

Keywords:
analgesiaanimal ethicsfarm animalsrandomized controlled trialsstudy design

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Area of Science:

  • Veterinary Science
  • Animal Welfare
  • Pharmacology

Background:

  • Animal pain studies in veterinary research primarily aim to improve animal welfare by evaluating novel analgesic treatments.
  • Control groups (positive and negative) are essential for comparing treatment effects.
  • There's increasing reluctance to use negative control groups due to animal welfare concerns.

Purpose of the Study:

  • To argue for the simultaneous inclusion of positive and negative control groups in animal pain studies, particularly in farm animals.
  • To enhance the reliability and accuracy of analgesic treatment effect estimations.
  • To improve overall animal welfare outcomes globally.

Main Methods:

  • The study proposes a methodological refinement for animal pain research.
  • It emphasizes the importance of both positive control groups (pain attenuated) and negative control groups (pain unattenuated).
  • The focus is on studies involving experimentally induced pain and small sample sizes.

Main Results:

  • Excluding negative control groups hinders the ability to validate study methods and differentiate treatment effects from baseline.
  • Single comparison groups in pain studies struggle to distinguish true treatment effects from experimental noise.
  • Simultaneous use of both control types provides study-specific definitions of pain and pain attenuation.

Conclusions:

  • Incorporating both positive and negative control groups enhances the reliability of pain studies and analgesic efficacy assessments.
  • This approach allows for more accurate estimations of treatment effects, especially in studies with inherent limitations.
  • Adopting these refinements can significantly improve animal welfare for millions of animals worldwide.