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Related Experiment Video

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Multiplexed Immunofluorescence Analysis and Quantification of Intratumoral PD-1+ Tim-3+ CD8+ T Cells

Multiplexed Immunofluorescence Analysis and Quantification of Intratumoral PD-1+ Tim-3+ CD8+ T Cells

Published on: February 8, 2018

Statistical analysis of histopathological endpoints.

John W Green¹, Timothy A Springer, Amy N Saulnier

¹DuPont Applied Statistics Group, Stine-Haskell Research Center, Newark, Delaware, USA.

Environmental Toxicology and Chemistry

|January 28, 2014

Summary

This summary is machine-generated.

A new statistical test, Rao-Scott Cochran-Armitage by Slices (RSCABS), improves analysis of fish histopathology in ecotoxicology studies. It accounts for severity, frequency, and dose-response relationships in replicate vessel designs.

Keywords:

Ecotoxicology Histopathology Overdispersion Severity score Step-down trend test

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Area of Science:

Aquatic Ecotoxicology
Histopathology
Statistical Modeling

Background:

Histopathological assessments in fish are crucial for aquatic ecotoxicology studies submitted to regulatory agencies.
Current statistical methods often fail to adequately analyze non-quantitative severity scores (0-4) from these studies.
Existing methods overlook concentration-response trends and correlations within replicate test vessels.

Purpose of the Study:

To introduce a novel statistical test, the Rao-Scott Cochran-Armitage by Slices (RSCABS).
To address the limitations of traditional statistical analyses in aquatic ecotoxicology.
To develop a method that incorporates replicate vessel design, severity, frequency, and dose-response relationships.

Main Methods:

The proposed Rao-Scott Cochran-Armitage by Slices (RSCABS) test is detailed.
The test retains individual subject scores while considering both severity and frequency of histopathological findings.
Power simulations and practical examples were used to demonstrate the test's performance.

Main Results:

The RSCABS test effectively incorporates replicate vessel experimental design.
It accounts for the biological expectation of increasing effect severity with higher concentrations.
The test successfully integrates individual scores, severity, frequency, and concentration-response trends.

Conclusions:

The RSCABS test offers a more robust statistical approach for analyzing fish histopathology data in ecotoxicology.
R-based and SAS-based software are available for implementing the RSCABS test.
This advancement aids regulatory submissions and improves the interpretation of ecotoxicological impacts on aquatic life.