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Updated: Jun 2, 2026

Online Virtual Reality Networked Control Laboratory Applied in Control Engineering Education
04:15

Online Virtual Reality Networked Control Laboratory Applied in Control Engineering Education

Published on: February 23, 2024

A case study of virtual control group verification using historical control data at a single facility.

Yuichiro Amano1,2, Hideto Hara2, Ikuro Takakura1,3

  • 1Non-Clinical Evaluation Expert Committee, Drug Evaluation Committee, Japan Pharmaceutical Manufacturers Association (JPMA).

The Journal of Toxicological Sciences
|May 31, 2026
PubMed
Summary
This summary is machine-generated.

Matching initial body weights is crucial for creating accurate Virtual Control Groups (VCGs) in toxicity studies. Deviations can obscure or falsely indicate significant toxicity findings, impacting study reliability.

Keywords:
Initial body weightMatching criteriaSampling errorVirtual control group

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Area of Science:

  • Toxicology
  • Pharmacology
  • Biostatistics

Background:

  • Toxicity studies in rodents rely on initial body weight for group assignment.
  • Virtual Control Groups (VCGs) are increasingly used, necessitating robust methods for their generation.
  • Accurate VCGs are vital for reliable interpretation of toxicity data.

Purpose of the Study:

  • To generate VCGs by linking toxicity parameters to initial body weights.
  • To verify the significance of body-weight matching in VCG generation.
  • To assess the impact of body-weight matching on toxicity endpoints like AST, ALT, and liver weight.

Main Methods:

  • Historical Control Data (HCD) from nine 4-week rat studies were used.
  • VCGs were generated by random sampling of initial body weights from HCD.
  • A ± 5 g range from the mean initial body weight of the test article group defined the matching criteria.

Main Results:

  • Statistically significant differences in AST and ALT levels between test and control groups often became non-significant when using VCGs.
  • VCGs generated outside the ± 5 g body weight range introduced new statistically significant differences in liver weight.
  • Liver weight showed a weak correlation with initial body weight, highlighting sensitivity to body-weight matching.

Conclusions:

  • Body-weight matching is critical for generating reliable VCGs in rodent toxicity studies.
  • Deviations from matched body weights can lead to inaccurate conclusions regarding toxicity.
  • The findings underscore the importance of precise body-weight criteria for VCGs, especially for body weight-correlated endpoints.