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Modeling approach to diameter breakpoint determination.

B A Craig1

  • 1Department of Statistics, Purdue University, 1399 Mathematical Sciences, West Lafayette, IN 47907-1399, USA. bacraig@stat.purdue.edu

Diagnostic Microbiology and Infectious Disease
|March 24, 2000
PubMed
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This study proposes a new hierarchical model for determining antimicrobial susceptibility testing zone diameter breakpoints, improving consistency and interpretability over traditional error-rate methods. The model accounts for key variables, offering a more reliable approach to breakpoint setting.

Area of Science:

  • Microbiology
  • Statistical Modeling
  • Antimicrobial Resistance

Background:

  • Current zone diameter breakpoint determination methods are susceptible to variability from factors like isolate numbers and test inherent variability.
  • Observed discrepancy percentages (very major, major, minor) in error-rate bounded methods can be unreliable for setting accurate breakpoints.

Purpose of the Study:

  • To develop a more consistent and interpretable method for determining zone diameter breakpoints.
  • To address the limitations of existing error-rate bounded methods in antimicrobial susceptibility testing.

Main Methods:

  • A hierarchical model was proposed to explicitly account for factors influencing zone diameter breakpoints.
  • Probabilities derived from the hierarchical model were used for breakpoint determination.

Related Experiment Videos

  • A simulation study was conducted to assess the model's consistency.
  • The model was applied to published scatterplots for interpretability assessment.

    • Main Results:

    • The proposed hierarchical model demonstrated improved consistency in determining zone diameter breakpoints compared to traditional methods.
    • The model-based procedure offers advantages in interpretability when applied to real-world data.
    • Simulation studies confirmed the enhanced reliability of the model-based approach.

    Conclusions:

    • The hierarchical model provides a robust framework for setting reliable zone diameter breakpoints in antimicrobial susceptibility testing.
    • This model-based approach enhances the accuracy and interpretability of breakpoint determination, crucial for guiding antimicrobial therapy.