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Sample size determinations using examples drawn from the NCTR Collaborative Behavioral Teratology Study data.

C V Vorhees1

  • 1Department of Pediatrics, University of Cincinnati, OH.

Neurotoxicology and Teratology
|July 1, 1989
PubMed
Summary
This summary is machine-generated.

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The coefficient of detection (CD) has limitations for assessing behavioral teratology study sensitivity. Power calculations offer a more robust method for determining sample sizes needed to detect group differences.

Area of Science:

  • Behavioral science
  • Toxicology
  • Statistical analysis

Background:

  • The Collaborative Behavioral Teratology Study (CBTS) used the coefficient of detection (CD) to assess test sensitivity.
  • The original CD formula is limited to one-group comparisons and 50% power, questioning its suitability for multi-group analyses.
  • Existing methods leave sensitivity questions regarding CBTS tests unanswered.

Purpose of the Study:

  • To address limitations of the coefficient of detection (CD) in the Collaborative Behavioral Teratology Study (CBTS).
  • To establish a more standard method for evaluating test sensitivity using power calculations.
  • To determine sample sizes required for detecting specific group mean differences in behavioral teratology.

Main Methods:

  • Utilized power calculations based on means and standard deviations from vehicle controls.

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  • Set significance level (alpha) at 0.05 and desired power (1-beta) at 0.80.
  • Calculated required sample sizes for detecting 20%, 30%, or 40% group mean differences for behavioral measures in CBTS Experiment 1.

    • Main Results:

    • Most behavioral measures can detect a 30% group mean difference with a two-group, two-tailed t-test and sample sizes of 20 litters per group.
    • Sample size requirements vary based on the desired detectable difference percentage.
    • More complex calculations are necessary for multi-group designs.

    Conclusions:

    • Power calculations provide a more reliable method for assessing test sensitivity in behavioral teratology studies.
    • Standardized sample sizes can be determined for detecting meaningful group mean differences.
    • The findings support the use of power analysis for designing future behavioral toxicology experiments.