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Multistrain experiments for screening toxic substances.

R P Felton1, D W Gaylor

  • 1National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR 72079.

Journal of Toxicology and Environmental Health
|January 1, 1989
PubMed
Summary
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Using multiple inbred animal strains in experiments increases statistical power, especially when chemical exposure affects at least 10% of subjects. This enhances the reliability of findings from the Mantel-Haenszel test.

Area of Science:

  • Toxicology and Pharmacology
  • Biostatistics
  • Experimental Design

Background:

  • Homogeneous experimental groups, such as inbred animal strains, are commonly used in toxicological studies.
  • The statistical power of tests, like the Mantel-Haenszel test, is crucial for detecting treatment effects.

Purpose of the Study:

  • To investigate the advantages of using homogeneous experimental groups (inbred animal strains).
  • To evaluate the benefits of employing multiple animal strains within a single experiment.
  • To assess the power of the Mantel-Haenszel test in multistrain experimental designs.

Main Methods:

  • A simulation experiment was conducted to empirically calculate the power of a one-sided Mantel-Haenszel test.
  • The study focused on multistrain experiments, comparing the power of such designs to individual strain analyses.

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  • Simulations incorporated subgroups with varying response rates to chemical exposure.

    • Main Results:

    • Using multiple inbred animal strains in experiments significantly increased the statistical power of the Mantel-Haenszel test.
    • This increase in power was particularly evident when chemical exposure led to an average increase in effects in 10% or more of the animals across strains.
    • The use of subgroups with differing response rates contributed to enhanced power in multistrain experiments.

    Conclusions:

    • Employing multiple inbred animal strains within a single experiment offers advantages in statistical power compared to individual strain testing.
    • Multistrain designs, particularly when utilizing subgroups with varied response rates, can improve the detection of chemical exposure effects.
    • The Mantel-Haenszel test demonstrates increased power in multistrain experiments under specific exposure conditions.